3537 [camera] Fixes crash on takePicture() (cla: yes, p: camera, platform-android)

3538 Enable CI tests on beta (cla: yes)

3539 [google_maps_flutter] Migrate platform interface to null safety (cla: yes, p: google_maps_flutter)

3540 Bump ffi dependencies (cla: yes, p: path_provider, platform-windows)

3541 [path_provider] Update Windows implementation version (cla: yes, p: path_provider)