3576 [flutter_plugin_android_lifecycle-sdk] Update Flutter SDK constraint (cla: yes, p: flutter_plugin_android_lifecycle, waiting for tree to go green)

3578 [video_player_platform_interface] Bump version for NNBD stable (cla: yes, nnbd, p: video_player, waiting for tree to go green)

3579 [image_picker] NNBD stable (cla: yes, nnbd, p: image_picker, waiting for tree to go green)

3580 [image_picker] use nnbd version of deps to resolve ci failure (cla: yes, nnbd, p: image_picker)

3582 [path_provider] Update to stable NNBD (cla: yes, nnbd, p: path_provider)