chore(deps): bump DeterminateSystems/flake-checker-action from 5 to 7 (…

…#138)

Bumps [DeterminateSystems/flake-checker-action](https://github.com/determinatesystems/flake-checker-action) from 5 to 7.
- [Release notes](https://github.com/determinatesystems/flake-checker-action/releases)
- [Commits](DeterminateSystems/flake-checker-action@v5...v7)

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

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

.github/workflows/ci.yml

@@ -19,6 +19,6 @@ jobs:
         run: nix flake check
 
       - name: Check Nix flake Nixpkgs inputs
-        uses: DeterminateSystems/flake-checker-action@v5
+        uses: DeterminateSystems/flake-checker-action@v7
         with:
           nixpkgs-keys: nixpkgs,unstable