chore(deps): update flake.lock (#3676)

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/49a4bd0' (2026-06-12)
  → 'github:NixOS/nixpkgs/3e41b24' (2026-06-16)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/5b929d8' (2026-06-13)
  → 'github:oxalica/rust-overlay/e8e2021' (2026-06-20)

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1781268102,
-        "narHash": "sha256-Zn5KTggEmUB3lXn/ccERNcBdddE6IaOFber9dWViWDg=",
+        "lastModified": 1781607440,
+        "narHash": "sha256-rxO+uc/KFbSJp+pgyXRuAX6QlG9hJdnt0BXpEQRXY+U=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "49a4bd0573c376468dd7996ddb6f9fa31d8c4d97",
+        "rev": "3e41b24abd260e8f71dbe2f5737d24122f972158",
         "type": "github"
       },
       "original": {
@@ -29,11 +29,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1781320681,
-        "narHash": "sha256-mjJ/VxJaIkgcUvKANgKOaaN5M1X1X+6NjCP0C5hw0WI=",
+        "lastModified": 1781925477,
+        "narHash": "sha256-QT9/mwEXqfrB9v7E2YGPeYTowXZP8c34behjJ9HuQKA=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "5b929d8c854149d926d05ea0cd6469bf4e54db27",
+        "rev": "e8e2021ee8cf3b58b000953ed3bee0d16b5e98e0",
         "type": "github"
       },
       "original": {