chore(deps): update flake.lock (#3423)

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/cbb5cf3' (2026-06-06)
  → 'github:NixOS/nixpkgs/49a4bd0' (2026-06-12)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/27b7e78' (2026-06-06)
  → 'github:oxalica/rust-overlay/5b929d8' (2026-06-13)

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1780747962,
-        "narHash": "sha256-IX7G1dlKrOqPOImfbo7ADDfV5yU1+j+MRChI3TL4tAA=",
+        "lastModified": 1781268102,
+        "narHash": "sha256-Zn5KTggEmUB3lXn/ccERNcBdddE6IaOFber9dWViWDg=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "cbb5cf358f50aa6acc9efd6113b7bcfbc352cd73",
+        "rev": "49a4bd0573c376468dd7996ddb6f9fa31d8c4d97",
         "type": "github"
       },
       "original": {
@@ -29,11 +29,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1780715792,
-        "narHash": "sha256-4+8gPeiPeud89mjo865RwpqmKwa1MThRsq2SvRxo7mg=",
+        "lastModified": 1781320681,
+        "narHash": "sha256-mjJ/VxJaIkgcUvKANgKOaaN5M1X1X+6NjCP0C5hw0WI=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "27b7e78c6935293ee868469cc4172e9b8b17823b",
+        "rev": "5b929d8c854149d926d05ea0cd6469bf4e54db27",
         "type": "github"
       },
       "original": {