Bump cachix/cachix-action from 14 to 16

Bumps [cachix/cachix-action](https://github.com/cachix/cachix-action) from 14 to 16.
- [Release notes](https://github.com/cachix/cachix-action/releases)
- [Commits](cachix/cachix-action@v14...v16)

---
updated-dependencies:
- dependency-name: cachix/cachix-action
  dependency-version: '16'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/check.yaml

@@ -13,7 +13,7 @@ jobs:
         with:
           extra-conf: |
             access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
-      - uses: cachix/cachix-action@v14
+      - uses: cachix/cachix-action@v16
         with:
           name: tek
           signingKey: ${{ secrets.CACHIX_SIGNING_KEY }}