ci: replace outdated Github action with Nix and Prettify

Author: drupol

.github/workflows/editorconfig-checks.yaml

@@ -10,5 +10,8 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v3
 
+      - name: Install Nix
+        uses: cachix/install-nix-action@v18
+
       - name: Check files for EditorConfig compliance
-        uses: editorconfig-checker/action-editorconfig-checker@v1
+        run: nix run nixpkgs#nodePackages.prettier -- --check .