deps: bump testcontainers-go v0.35.0 → v0.42.0; drops docker/docker dep entirely (clears CVE-2026-34040)

Dependabot flagged GHSA-x744-4wpc-v9h2 / CVE-2026-34040 (Moby AuthZ
plugin bypass on oversized request bodies, incomplete fix for
CVE-2024-41110) on the transitive github.com/docker/docker
v27.1.1+incompatible pulled in via testcontainers-go v0.35.0.

Reachability check before fixing:

  - certctl does not run dockerd or configure AuthZ plugins.
  - go list -deps ./cmd/{server,agent,cli,mcp-server}/... finds zero
    docker/docker references in any production binary's transitive
    set.
  - testcontainers is consumed only by *_test.go files under
    internal/repository/postgres/ + deploy/test/ for ephemeral
    Postgres containers.

So the CVE was not reachable from any shipped certctl artefact.
Bump anyway because Dependabot noise is noise; the upgrade is
mechanical.

Bumping testcontainers-go v0.35.0 → v0.42.0 (latest, 2026-04-09)
removes the direct docker/docker dependency entirely — testcontainers
v0.42.0 reorganized away from the Moby SDK. After 'go mod tidy',
docker/docker is GONE from both go.mod and go.sum, not merely
bumped. The Dependabot alert closes automatically on push.

Co-bumped transitives (cascading from testcontainers' new dep tree):

  go.opentelemetry.io/otel               v1.24.0  → v1.41.0
  go.opentelemetry.io/otel/{metric,trace} v1.24.0  → v1.41.0
  go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp
                                         v0.49.0  → v0.60.0
  go.opentelemetry.io/auto/sdk           added    @ v1.2.1
  golang.org/x/crypto                    v0.45.0  → v0.48.0
  golang.org/x/net                       v0.47.0  → v0.49.0
  golang.org/x/sync                      v0.18.0  → v0.19.0
  golang.org/x/sys                       v0.40.0  → v0.42.0
  golang.org/x/text                      v0.31.0  → v0.34.0

Verification (all green):

  go build ./cmd/server/... ./cmd/agent/... ./cmd/cli/... \
           ./cmd/mcp-server/...                          → exit 0
  go test -run=NONE -count=1 ./internal/repository/postgres/  → ok
  go test -tags=integration -run=NONE -count=1 ./deploy/test/ → ok
  go vet ./internal/repository/postgres/...                   → clean
  go list -deps ./cmd/{server,agent,cli,mcp-server}/... |
    grep docker                                               → zero hits

Diff: 2 files (go.mod, go.sum), 129 insertions / 144 deletions.

Closes: GHSA-x744-4wpc-v9h2, CVE-2026-34040

go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/google/uuid v1.6.0
 	github.com/lib/pq v1.10.9
 	github.com/modelcontextprotocol/go-sdk v1.4.1
-	github.com/testcontainers/testcontainers-go v0.35.0
+	github.com/testcontainers/testcontainers-go v0.42.0
 )
 
 require (
@@ -22,16 +22,16 @@ require (
 	github.com/leanovate/gopter v0.2.11
 	github.com/masterzen/winrm v0.0.0-20250927112105-5f8e6c707321
 	github.com/pkg/sftp v1.13.10
-	golang.org/x/crypto v0.45.0
-	golang.org/x/sync v0.18.0
+	golang.org/x/crypto v0.48.0
+	golang.org/x/sync v0.19.0
 	software.sslmate.com/src/go-pkcs12 v0.7.0
 )
 
 require (
-	dario.cat/mergo v1.0.0 // indirect
+	dario.cat/mergo v1.0.2 // indirect
 	github.com/Azure/azure-sdk-for-go/sdk/internal v1.11.2 // indirect
 	github.com/Azure/azure-sdk-for-go/sdk/security/keyvault/internal v1.2.0 // indirect
-	github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 // indirect
+	github.com/Azure/go-ansiterm v0.0.0-20250102033503-faa5f7b0171c // indirect
 	github.com/Azure/go-ntlmssp v0.1.1 // indirect
 	github.com/AzureAD/microsoft-authentication-library-for-go v1.6.0 // indirect
 	github.com/ChrisTrenkamp/goxpath v0.0.0-20210404020558-97928f7e12b6 // indirect
@@ -49,22 +49,23 @@ require (
 	github.com/aws/aws-sdk-go-v2/service/sts v1.42.1 // indirect
 	github.com/bodgit/ntlmssp v0.0.0-20240506230425-31973bb52d9b // indirect
 	github.com/bodgit/windows v1.0.1 // indirect
-	github.com/cenkalti/backoff/v4 v4.2.1 // indirect
-	github.com/containerd/containerd v1.7.18 // indirect
+	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/containerd/errdefs v1.0.0 // indirect
+	github.com/containerd/errdefs/pkg v0.3.0 // indirect
 	github.com/containerd/log v0.1.0 // indirect
 	github.com/containerd/platforms v0.2.1 // indirect
 	github.com/cpuguy83/dockercfg v0.3.2 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/distribution/reference v0.6.0 // indirect
-	github.com/docker/docker v27.1.1+incompatible // indirect
-	github.com/docker/go-connections v0.5.0 // indirect
+	github.com/docker/go-connections v0.6.0 // indirect
 	github.com/docker/go-units v0.5.0 // indirect
+	github.com/ebitengine/purego v0.10.0 // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect
-	github.com/go-logr/logr v1.4.1 // indirect
+	github.com/go-logr/logr v1.4.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-ole/go-ole v1.2.6 // indirect
 	github.com/gofrs/uuid v4.4.0+incompatible // indirect
-	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang-jwt/jwt/v5 v5.3.0 // indirect
 	github.com/google/jsonschema-go v0.4.2 // indirect
 	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
@@ -75,42 +76,44 @@ require (
 	github.com/jcmturner/goidentity/v6 v6.0.1 // indirect
 	github.com/jcmturner/gokrb5/v8 v8.4.4 // indirect
 	github.com/jcmturner/rpc/v2 v2.0.3 // indirect
-	github.com/klauspost/compress v1.17.4 // indirect
+	github.com/klauspost/compress v1.18.5 // indirect
 	github.com/kr/fs v0.1.0 // indirect
 	github.com/kylelemons/godebug v1.1.0 // indirect
 	github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 // indirect
-	github.com/magiconair/properties v1.8.7 // indirect
+	github.com/magiconair/properties v1.8.10 // indirect
 	github.com/masterzen/simplexml v0.0.0-20190410153822-31eea3082786 // indirect
 	github.com/moby/docker-image-spec v1.3.1 // indirect
-	github.com/moby/patternmatcher v0.6.0 // indirect
-	github.com/moby/sys/sequential v0.5.0 // indirect
-	github.com/moby/sys/user v0.1.0 // indirect
-	github.com/moby/term v0.5.0 // indirect
-	github.com/morikuni/aec v1.0.0 // indirect
+	github.com/moby/go-archive v0.2.0 // indirect
+	github.com/moby/moby/api v1.54.1 // indirect
+	github.com/moby/moby/client v0.4.0 // indirect
+	github.com/moby/patternmatcher v0.6.1 // indirect
+	github.com/moby/sys/sequential v0.6.0 // indirect
+	github.com/moby/sys/user v0.4.0 // indirect
+	github.com/moby/sys/userns v0.1.0 // indirect
+	github.com/moby/term v0.5.2 // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
-	github.com/opencontainers/image-spec v1.1.0 // indirect
+	github.com/opencontainers/image-spec v1.1.1 // indirect
 	github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c // indirect
-	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c // indirect
+	github.com/power-devops/perfstat v0.0.0-20240221224432-82ca36839d55 // indirect
 	github.com/segmentio/asm v1.1.3 // indirect
 	github.com/segmentio/encoding v0.5.4 // indirect
-	github.com/shirou/gopsutil/v3 v3.23.12 // indirect
-	github.com/shoenig/go-m1cpu v0.1.6 // indirect
-	github.com/sirupsen/logrus v1.9.3 // indirect
+	github.com/shirou/gopsutil/v4 v4.26.3 // indirect
+	github.com/sirupsen/logrus v1.9.4 // indirect
 	github.com/stretchr/testify v1.11.1 // indirect
 	github.com/tidwall/transform v0.0.0-20201103190739-32f242e2dbde // indirect
-	github.com/tklauser/go-sysconf v0.3.12 // indirect
-	github.com/tklauser/numcpus v0.6.1 // indirect
+	github.com/tklauser/go-sysconf v0.3.16 // indirect
+	github.com/tklauser/numcpus v0.11.0 // indirect
 	github.com/yosida95/uritemplate/v3 v3.0.2 // indirect
-	github.com/yusufpapurcu/wmi v1.2.3 // indirect
-	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.49.0 // indirect
-	go.opentelemetry.io/otel v1.24.0 // indirect
-	go.opentelemetry.io/otel/metric v1.24.0 // indirect
-	go.opentelemetry.io/otel/trace v1.24.0 // indirect
-	golang.org/x/net v0.47.0 // indirect
+	github.com/yusufpapurcu/wmi v1.2.4 // indirect
+	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.60.0 // indirect
+	go.opentelemetry.io/otel v1.41.0 // indirect
+	go.opentelemetry.io/otel/metric v1.41.0 // indirect
+	go.opentelemetry.io/otel/trace v1.41.0 // indirect
+	golang.org/x/net v0.49.0 // indirect
 	golang.org/x/oauth2 v0.34.0 // indirect
-	golang.org/x/sys v0.40.0 // indirect
-	golang.org/x/text v0.31.0 // indirect
+	golang.org/x/sys v0.42.0 // indirect
+	golang.org/x/text v0.34.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )