Bump actions/checkout version

Author: W0rma

.github/workflows/main.yml

@@ -13,7 +13,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup PHP != 8.5
         if: ${{ matrix.php != '8.5' }}