chore(deps): bump DeterminateSystems/flake-checker-action from 7 to 8

Bumps [DeterminateSystems/flake-checker-action](https://github.com/determinatesystems/flake-checker-action) from 7 to 8.
- [Release notes](https://github.com/determinatesystems/flake-checker-action/releases)
- [Commits](DeterminateSystems/flake-checker-action@v7...v8)

---
updated-dependencies:
- dependency-name: DeterminateSystems/flake-checker-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
-      - uses: DeterminateSystems/flake-checker-action@v7
+      - uses: DeterminateSystems/flake-checker-action@v8
       - uses: cachix/install-nix-action@v25
         with:
           github_access_token: ${{ secrets.GH_TOKEN }}