Update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/dacapo-testing.yml

@@ -13,7 +13,7 @@ jobs:
         php-versions: ['8.0', '8.1', '8.2']
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2

.github/workflows/phpstan.yml

@@ -6,7 +6,7 @@ jobs:
   phpstan:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Install Dependencies
         run: |

.github/workflows/pint.yml

@@ -6,7 +6,7 @@ jobs:
   pint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Install Dependencies
         run: composer install -q --no-ansi --no-interaction --no-scripts --no-suggest --prefer-dist --working-dir=tools/pint