Update engine testing to use api 33 for android tests. (#42351)

#flutter/flutter/127682
The plurality of android users are on api 33. We should be testing on our most used android api.

Author: reidbaker

ci/firebase_testlab.py

@@ -54,7 +54,7 @@ def run_firebase_test(apk, results_dir):
           '--results-dir',
           results_dir,
           '--device',
-          'model=redfin,version=30',
+          'model=oriole,version=33',
       ],
       stdout=subprocess.PIPE,
       stderr=subprocess.STDOUT,