To reproduce the deprecation warning

1. Go to local build root folder, typically located one level up of the engine directory. Then change the ios_deployment_target to 17.0: https://github.com/flutter/buildroot/blob/master/build/config/ios/ios_sdk.gni#L19
2. Add -Wdeprecated-declarations and -Wdeprecated-implementations in flutter_clags_objc https://github.com/flutter/engine/blob/main/common/config.gni#L60
3. Build the local engine like you normally would.

List of deprecated APIs

'statusBarHidden' is deprecated: first deprecated in iOS 13.0 - Use the statusBarManager property of the window scene instead. [-Werror,-Wdeprecated-declarations]

'setStatusBarStyle:' is deprecated: first deprecated in iOS 9.0 - Use -[UIViewController preferredStatusBarStyle] [-Werror,-Wdeprecated-declarations]
[[UIApplication sharedApplication] setStatusBarStyle:statusBarStyle];

'statusBarOrientation' is deprecated: first deprecated in iOS 13.0 - Use the interfaceOrientation property of the window scene instead. [-Werror,-Wdeprecated-declarations]

Flutter does not support iOS 9 anymore so we should be able to remove setStatusBarStyle completely.