chore(deps): update flake.lock (#9108)

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/674a202' (2026-10-24)
  → 'github:NixOS/nixpkgs/a078812' (2026-10-31)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/5b9f119' (2026-10-24)
  → 'github:oxalica/rust-overlay/6ecf534' (2026-10-31)

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1792812153,
-        "narHash": "sha256-T2+XBfNbf9pecLUWS4+RtuVNZ3W8K5taG5QdV71mWlk=",
+        "lastModified": 1793466162,
+        "narHash": "sha256-pt+peAEoOK3lLLdtbnQ1AGIBTZbdB6jrkgmurfcQwig=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "674a2028661e550a97400c1cc992b9cca9a668a1",
+        "rev": "a0788123ada57ec92a79ab2581cda6d3c6cca75f",
         "type": "github"
       },
       "original": {
@@ -29,11 +29,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1792825530,
-        "narHash": "sha256-aphXA2IFNd3q48++TKmfuuvDDjkrgGdJDnDIhij9684=",
+        "lastModified": 1793434469,
+        "narHash": "sha256-+sgVNI2c67di+XIeMaz5KSei4T65kX68s5Nl0E5Gzbc=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "5b9f1198b59bcb31c5c3250b332e7d77590e6306",
+        "rev": "6ecf534a7c16e7c969f26838fdd8c93597ae93f3",
         "type": "github"
       },
       "original": {