Update AppAttest integration tests to use Xcode 16.4 + macos-15 as well

Author: w-goog

.github/workflows/integration_tests.yml

@@ -90,9 +90,9 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@v3
-    - name: Use Xcode 15.0.1
+    - name: Select Xcode
       run: |
-        sudo xcode-select -s /Applications/Xcode_15.0.1.app
+	sudo xcode-select -s /Applications/Xcode_16.4.app/Contents/Developer
     - name: Build test target for App Check Example
       run: |
         xcodebuild \
@@ -110,5 +110,6 @@ jobs:
           test-without-building \
           -scheme AppAttestExample \
           -sdk iphonesimulator \
+          -destination 'platform=iOS Simulator,name=iPhone 16' \
           AppCheckDebugToken=$AppCheckDebugToken \
           APP_CHECK_WEB_API_KEY=$APP_CHECK_WEB_API_KEY