Default to Xcode 16.3 in CI job for building example app

Author: lukaskubanek

.github/workflows/ci.yml

@@ -50,6 +50,11 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+      
+      - name: Select Xcode version
+        run: |
+          sudo xcode-select -s /Applications/Xcode_16.3.app
+          xcodebuild -version
 
       - name: Build example app
         run: |