chore(deps): update flake.lock (#3139)

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/3d8f0f3' (2026-05-23)
  → 'github:NixOS/nixpkgs/e9a7635' (2026-05-29)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/d9973e2' (2026-05-23)
  → 'github:oxalica/rust-overlay/85570ef' (2026-05-30)

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1779536132,
-        "narHash": "sha256-q+fF42iv/geEbHfgSzy3tS0FF/EyD6XTZ98E6yxiBO8=",
+        "lastModified": 1780030872,
+        "narHash": "sha256-u6WU/yd/o8iYQrHX3RAwO1hYa3LkoSL+WNQD0rJfJZQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "3d8f0f3f72a6cd4d93d0ad13203f2ea1cb7e1456",
+        "rev": "e9a7635a57597d9754eccebdfc7045e6c8600e6b",
         "type": "github"
       },
       "original": {
@@ -29,11 +29,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1779506148,
-        "narHash": "sha256-OffE5yuMrSW71zIJNLvtl9MCO6WTAHEjlFPUCvkd/QM=",
+        "lastModified": 1780110990,
+        "narHash": "sha256-6QBThUi7SuK+dgA+DCaEkQGZN4kYx6DpXmK45+MG9zI=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "d9973e2ab49747fada06ebbe26cda27eb0220cf1",
+        "rev": "85570ef134d92a8702de6afd1f6f0209c863fa91",
         "type": "github"
       },
       "original": {