nix: update workflow and bump flake

.github/workflows/nix-update.yaml

@@ -0,0 +1,25 @@
+name: "Nix: update lockfile"
+
+on:
+  schedule:
+    - cron: '0 0 */14 * *'
+  workflow_dispatch:
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Clone repository
+      uses: actions/checkout@v3
+    - name: Install nix
+      uses: cachix/install-nix-action@v17
+      with:
+        install_url: https://releases.nixos.org/nix/nix-2.8.0/install
+        extra_nix_config: |
+          auto-optimise-store = true
+          experimental-features = nix-command flakes
+    - name: Update lockfile
+      run: nix flake update
+    - uses: stefanzweifel/git-auto-commit-action@v4
+      with:
+        commit_message: "[gha] bump flake inputs"

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1652659998,
-        "narHash": "sha256-FqNrXC1EE6U2RACwXBlsAvg1lqQGLYpuYb6+W3DL9vA=",
+        "lastModified": 1653407748,
+        "narHash": "sha256-g9puJaILRTb9ttlLQ7IehpV7Wcy0n+vs8LOFu6ylQcM=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "1d7db1b9e4cf1ee075a9f52e5c36f7b9f4207502",
+        "rev": "5ce6597eca7d7b518c03ecda57d45f9404b5e060",
         "type": "github"
       },
       "original": {
@@ -26,11 +26,11 @@
       "flake": false,
       "locked": {
         "host": "gitlab.freedesktop.org",
-        "lastModified": 1652629480,
-        "narHash": "sha256-4mouFPYB2VwgPi92trvAk8JAGjvkYm+DX72sUzljCXA=",
+        "lastModified": 1653502661,
+        "narHash": "sha256-unQ1j3jleghIMi340dJTJZZ1ffwm1cI7gaQbdKd7laE=",
         "owner": "wlroots",
         "repo": "wlroots",
-        "rev": "8fe3aa29da56be16faa73aca947647bd60cd4a94",
+        "rev": "1cb6b2cf673a5b580d7ad79ce2b37c14b14b0268",
         "type": "gitlab"
       },
       "original": {