Merge pull request #24 from OskarStark/checkout

Update actions/checkout

Author: xabbuh

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Set up PHP
         uses: shivammathur/setup-php@v2