Upgrade laravel.yml workflow

Node.js 16 actions are deprecated, thus updating actions/checkout to v4 using Node.js 20.

.github/workflows/laravel.yml

@@ -20,7 +20,7 @@ jobs:
         uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php-versions }}
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Copy .env
         run: php -r "file_exists('.env') || copy('.env.example', '.env');"
       - name: Install Dependencies