chore: update PHP version and actions/checkout version in workflows

Author: vinkla

.github/workflows/php-cs-fixer.yml

@@ -13,10 +13,10 @@ jobs:
     name: PER-CS
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: shivammathur/setup-php@v2
         with:
-          php-version: 8.3
+          php-version: 8.4
           coverage: xdebug
           tools: php-cs-fixer, cs2pr
       - run: php-cs-fixer fix . --dry-run --rules=@PER-CS --format=checkstyle | cs2pr

.github/workflows/phpunit.yml

@@ -18,7 +18,7 @@ jobs:
     name: PHP ${{ matrix.php }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php }}