Update github workflows for 5.2.x branch

.github/workflows/documentation-upload.yml

@@ -4,7 +4,7 @@ on:
   workflow_dispatch:
     inputs:
       releaseVersion:
-        description: "Release version"
+        description: "Release version (5.2.x)"
         required: true
 
 jobs:
@@ -17,6 +17,8 @@ jobs:
 
       - name: Checkout source code
         uses: actions/checkout@v3
+        with:
+          ref: '5.2.x'
 
       - name: Set up JDK 17
         uses: actions/setup-java@v3