chore(deps): update cachix/cachix-action action to v16

Author: renovate[bot]

.github/workflows/nix-github-actions.yml

@@ -30,7 +30,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: cachix/install-nix-action@v31
       - name: Add nix-community cache
-        uses: cachix/cachix-action@v15
+        uses: cachix/cachix-action@v16
         with:
           name: nix-community
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'