ci: update actions/checkout 4 => 5

Author: Chris8934

.github/workflows/code_checks.yaml

@@ -62,7 +62,7 @@ jobs:
     name: PHP ${{ matrix.php }} - ${{ matrix.symfony-version }} - ${{ matrix.stability }}
     steps:
       # basically git clone
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Cache dependencies
         uses: actions/cache@v4
@@ -106,7 +106,7 @@ jobs:
       contents: write
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - uses: shivammathur/setup-php@v2
         with:
@@ -132,7 +132,7 @@ jobs:
   phpstan:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: shivammathur/setup-php@v2
         with:
           php-version: 8.3