Bump actions/checkout from 6 to 7

Author: dependabot[bot]

.github/workflows/tests.yml

@@ -28,7 +28,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Set up PHP ${{ matrix.php }}
         uses: shivammathur/setup-php@v2