Bump actions/checkout from 6 to 7 (#90)

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/auto-update.yml

@@ -26,7 +26,7 @@ jobs:
           remove-docker-images: 'true'
 
       - name: Checkout repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Set up QEMU
         id: qemu

flake.lock

@@ -68,11 +68,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1782014548,
-        "narHash": "sha256-zYKx9xcbPvk4zOzkny3w2/AkuKhJqGwRD+piA3urkx8=",
+        "lastModified": 1782145344,
+        "narHash": "sha256-8cz8/2hWTYdsPcpqWXa/IAkyjw1xBv3tx2UPNzkpe3c=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "72349305fb839e27697873de7a4ce3a98c378f48",
+        "rev": "8dc49b8b206a683d1f6605e0fd993c0f5d49c98d",
         "type": "github"
       },
       "original": {