update workflow

Author: wol-soft

.github/workflows/main.yml

@@ -12,7 +12,7 @@ jobs:
     name: PHP ${{ matrix.php }} tests
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2