chore(deps): update cachix/install-nix-action digest to 4e002c8

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@0b0e072294b088b73964f1d72dfdac0951439dbd  # v31
+      - uses: cachix/install-nix-action@4e002c8ec80594ecd40e759629461e26c8abed15  # v31
         with:
           nix_path: nixpkgs=channel:nixos-unstable
       # Pull from the cachix cache