1542 [video_player] Android: Fix ide warnings in video_player (cla: yes)

1543 [cloud_firestore] Fix wrong FieldValue (cla: yes)

1544 [image_picker]fix license format. (cla: yes)

1545 [firebase_ml_vision] [share] Fix analyzer warnings from const Rect constructor. (cla: yes)

1549 [google_maps_flutter] Support Color’s alpha channel when converting to UIColor on iOS (cla: yes)

1552 [video_player] Fix player initialization and other warnings (cla: yes)