flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/4c1018d' (2026-04-09)
  → 'github:NixOS/nixpkgs/4bd9165' (2026-04-14)

flake.lock

@@ -265,11 +265,11 @@
         "rust-overlay": "rust-overlay"
       },
       "locked": {
-        "lastModified": 1775866084,
-        "narHash": "sha256-mWn8D/oXXAaqeFFFRorKHvTLw5V9M8eYzAWRr4iffag=",
+        "lastModified": 1776248416,
+        "narHash": "sha256-TC6yzbCAex1pDfqUZv9u8fVm8e17ft5fNrcZ0JRDOIQ=",
         "owner": "nix-community",
         "repo": "lanzaboote",
-        "rev": "29d2cca7fc3841708c1d48e2d1272f79db1538b6",
+        "rev": "18e9e64bae15b828c092658335599122a6db939b",
         "type": "github"
       },
       "original": {
@@ -408,11 +408,11 @@
     },
     "nixpkgs_3": {
       "locked": {
-        "lastModified": 1775710090,
-        "narHash": "sha256-ar3rofg+awPB8QXDaFJhJ2jJhu+KqN/PRCXeyuXR76E=",
+        "lastModified": 1776169885,
+        "narHash": "sha256-l/iNYDZ4bGOAFQY2q8y5OAfBBtrDAaPuRQqWaFHVRXM=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "4c1018dae018162ec878d42fec712642d214fdfa",
+        "rev": "4bd9165a9165d7b5e33ae57f3eecbcb28fb231c9",
         "type": "github"
       },
       "original": {