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

Author: renovate[bot]

.github/workflows/build.yaml

@@ -23,7 +23,7 @@ jobs:
       uses: cachix/install-nix-action@v30
 
     - name: Setup cachix
-      uses: cachix/cachix-action@v15
+      uses: cachix/cachix-action@v16
       with:
         name: ${{ env.cacheName }}
         authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'