[경고대응] 'windows' was deprecated in iOS 15.0: Use UIWindowScene.windows on a relevant window scene instead

경고 문구

'windows' was deprecated in iOS 15.0: Use UIWindowScene.windows on a relevant window scene instead

[AS-IS]

 guard let window = UIApplication.shared.windows.first else { return }

[To-Be]

let scenes = UIApplication.shared.connectedScenes
guard let windowScene = scenes.first as? UIWindowScene,
      let window = windowScene.windows.first
else { return }