4409 [google_maps_flutter][android] suppress unchecked cast warning (cla: yes, waiting for tree to go green, p: google_maps_flutter, platform-android, last mile)

4411 [shared_preferences] Fix example in readme for mocking values (cla: yes, waiting for tree to go green, p: shared_preferences, last mile)

4446 [webview_flutter] Add interface methods to load local files and HTML strings. (cla: yes, waiting for tree to go green, p: webview_flutter)

4449 [local_auth] Fix activity leak in LocalAuthPlugin (cla: yes, waiting for tree to go green, p: local_auth, platform-android, last mile)

4450 [webview_flutter] Add platform interface method loadRequest. (cla: yes, waiting for tree to go green, p: webview_flutter)