ci: bump cachix/cachix-action from 16 to 17

Bumps [cachix/cachix-action](https://github.com/cachix/cachix-action) from 16 to 17.
- [Release notes](https://github.com/cachix/cachix-action/releases)
- [Commits](https://github.com/cachix/cachix-action/compare/v16...v17)

---
updated-dependencies:
- dependency-name: cachix/cachix-action
  dependency-version: '17'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/github_pages.yml

@@ -16,7 +16,7 @@ jobs:
       - uses: cachix/install-nix-action@v31
         with:
           nix_path: nixpkgs=channel:nixos-unstable
-      - uses: cachix/cachix-action@v16
+      - uses: cachix/cachix-action@v17
         with:
           name: nix-community
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'