chore(deps): update cachix/install-nix-action digest to 51f3067

Author: renovate[bot]

.github/workflows/nix.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       # Install Nix on the runner
-      - uses: cachix/install-nix-action@1ca7d21a94afc7c957383a2d217460d980de4934  # v31
+      - uses: cachix/install-nix-action@51f3067b56fe8ae331890c77d4e454f6d60615ff  # v31
         with:
           nix_path: nixpkgs=channel:nixos-unstable
       # Pull from the cachix cache