Workaround Xcode 14 CocoaPods Resource build issue (#10326)

.github/workflows/zip.yml

@@ -402,6 +402,9 @@ jobs:
       SDK: "Firestore"
     runs-on: macos-12
     steps:
+      # Xcode 14 fails to build FirebaseAuthUI because it includes Resources. See #9886.
+    - name: Xcode 13.3.1
+      run: sudo xcode-select -s /Applications/Xcode_13.3.1.app/Contents/Developer
     - uses: actions/checkout@v2
     - name: Get framework dir
       uses: actions/download-artifact@v1