flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/cdead16a444a3e5de7bc9b0af8e198b11bb01804' (2023-01-20)
  → 'github:NixOS/nixpkgs/781df3d2de37ace250ba3c2731606c0b6bee465b' (2023-04-14)
• Updated input 'openwrt':
    'git+https://git.openwrt.org/openwrt/openwrt.git?ref=openwrt-22.03&rev=1bead4c521b6f6cf711fd06398d54b1a6fbbef96' (2023-01-20)
  → 'git+https://git.openwrt.org/openwrt/openwrt.git?ref=openwrt-22.03&rev=9af29da281213108cd861ed77b0416bf6eda0aaf' (2023-04-13)
• Updated input 'openwrt-imagebuilder':
    'github:astro/nix-openwrt-imagebuilder/676f6c33fda9e0c94232001249364aebde67ffe4' (2023-02-25)
  → 'github:astro/nix-openwrt-imagebuilder/b3d1f398472452ea288ce2d8dbf20d6115bf1c64' (2023-04-14)

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1674242456,
-        "narHash": "sha256-yBy7rCH7EiBe9+CHZm9YB5ii5GRa+MOxeW0oDEBO8SE=",
+        "lastModified": 1681490924,
+        "narHash": "sha256-6WrkhmG0pI09VqeYWRLxEgNlVeWdnM5at6vm0w4prBk=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "cdead16a444a3e5de7bc9b0af8e198b11bb01804",
+        "rev": "781df3d2de37ace250ba3c2731606c0b6bee465b",
         "type": "github"
       },
       "original": {
@@ -19,11 +19,11 @@
     "openwrt": {
       "flake": false,
       "locked": {
-        "lastModified": 1674227662,
-        "narHash": "sha256-MtkO4sbP+75B9j2oW0/JFvosWQh8H0S95VJ3r0wl+xk=",
+        "lastModified": 1681412046,
+        "narHash": "sha256-mW4B/9GVminuxC0EM6WeQ9soqBy2k8INjhpT+mrnIow=",
         "ref": "openwrt-22.03",
-        "rev": "1bead4c521b6f6cf711fd06398d54b1a6fbbef96",
-        "revCount": 54502,
+        "rev": "9af29da281213108cd861ed77b0416bf6eda0aaf",
+        "revCount": 54587,
         "type": "git",
         "url": "https://git.openwrt.org/openwrt/openwrt.git"
       },
@@ -40,11 +40,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1677318794,
-        "narHash": "sha256-lJwIENSkGO6zXCt91SkzWNb4IGQtjmqUoTXqfhYHWaA=",
+        "lastModified": 1681468707,
+        "narHash": "sha256-aD+74KowPjyxWP+bIqmZZaIHe5WxEhoXOSF+qOOCwPg=",
         "owner": "astro",
         "repo": "nix-openwrt-imagebuilder",
-        "rev": "676f6c33fda9e0c94232001249364aebde67ffe4",
+        "rev": "b3d1f398472452ea288ce2d8dbf20d6115bf1c64",
         "type": "github"
       },
       "original": {