chore(deps): update cachix/install-nix-action action to v19 (#23)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/prettier.yml

@@ -14,7 +14,7 @@ jobs:
               uses: actions/checkout@v3
 
             - name: Install the Nix package manager
-              uses: cachix/install-nix-action@v18
+              uses: cachix/install-nix-action@v19
 
             - name: Checks
               run: nix run nixpkgs#nodePackages.prettier -- --check .