build(deps): Bump DeterminateSystems/flake-checker-action from 8 to 9

Bumps [DeterminateSystems/flake-checker-action](https://github.com/determinatesystems/flake-checker-action) from 8 to 9.
- [Release notes](https://github.com/determinatesystems/flake-checker-action/releases)
- [Commits](DeterminateSystems/flake-checker-action@v8...v9)

---
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]>

.github/workflows/check.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: DeterminateSystems/nix-installer-action@v14
       - uses: DeterminateSystems/magic-nix-cache-action@v8
-      - uses: DeterminateSystems/flake-checker-action@v8
+      - uses: DeterminateSystems/flake-checker-action@v9
 
       - name: Check nix file formatting ❄️
         run: 'nix fmt . -- --check'