Revert "Update xcode version"

This reverts commit 0d2eff5.

Author: mahmoud-elmorabea

.github/workflows/build-sample-apps.yml

@@ -10,7 +10,7 @@ concurrency: # cancel previous workflow run if one exists.
   cancel-in-progress: true
 
 env:
-  XCODE_VERSION: "16.2"
+  XCODE_VERSION: "15.3"
 
 jobs:
   update-pr-comment: