chore(deps): update cachix/install-nix-action action to v30

Author: mic92-renovate[bot]

.github/workflows/update-vendor-hash.yml

@@ -14,7 +14,7 @@ jobs:
           ref: ${{ github.event.pull_request.head.sha }}
           fetch-depth: 0
       - name: Install Nix
-        uses: cachix/install-nix-action@v29
+        uses: cachix/install-nix-action@v30
         with:
           github_access_token: ${{ secrets.GITHUB_TOKEN }}
           nix_path: nixpkgs=channel:nixos-unstable