Merge pull request #24 from PHPCompatibility/dependabot/github_actions/actions/checkout-4

GH Actions: Bump actions/checkout from 3 to 4

Author: jrfnl

.github/workflows/validate.yml

@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install PHP
         uses: shivammathur/setup-php@v2