[CI] Run cocoapods-integration job on Xcode 16.4 (#15215)

Author: andrewheard

.github/workflows/cocoapods-integration.yml

@@ -26,6 +26,8 @@ jobs:
     - uses: mikehardy/buildcache-action@c87cea0ccd718971d6cc39e672c4f26815b6c126
       with:
         cache_key: ${{ matrix.os }}
+    - name: Xcode
+      run: sudo xcode-select -s /Applications/Xcode_16.4.app/Contents/Developer
     - name: Get realpath
       run: brew install coreutils
     - name: Build and test