Update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
     name: PHP ${{ matrix.php }} ${{ matrix.description }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2

.github/workflows/coverage.yml

@@ -19,7 +19,7 @@ jobs:
     name: PHP ${{ matrix.php }} ${{ matrix.description }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2