Change FTL test to high capacity device (#47579)

Changes the FTL tests to use a high capacity device

Similar PR from packages repo: flutter/packages#5224

The list of devices (and their capacity) is visible through the [3rd option here "Google APIs Explorer"](https://firebase.google.com/docs/test-lab/android/available-testing-devices), without a login to any project.

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style

Author: gmackall

ci/firebase_testlab.py

@@ -54,7 +54,7 @@ def run_firebase_test(apk, results_dir):
           '--results-dir',
           results_dir,
           '--device',
-          'model=oriole,version=33',
+          'model=panther,version=33',
       ],
       stdout=subprocess.PIPE,
       stderr=subprocess.STDOUT,