chore(deps): bump cachix/install-nix-action from 13 to 16 (#325)

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from 13 to 16.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](cachix/install-nix-action@v13...v16)

---
updated-dependencies:
- dependency-name: cachix/install-nix-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/plutus-playground-e2e-tests.yml

@@ -19,7 +19,7 @@ jobs:
         cabal-version: '3.2.0.0'
 
     - name: Setup Nix
-      uses: cachix/install-nix-action@v13
+      uses: cachix/install-nix-action@v16
       with:
         nix_path: nixpkgs=channel:nixos-unstable
         extra_nix_config: |