Revert "Bump actions/checkout from 5 to 6 (SAP-samples#572)"

This reverts commit 575430f.

Author: DevJLALW

.github/workflows/maven.yml

@@ -20,7 +20,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v6
+      uses: actions/checkout@v5
     - name: Set up JDK
       uses: actions/setup-java@v5
       with: