flutter 升级到2.2.0

[LKShadow]

flutter升级到2.2.0后，新创建的flutter项目 pubspec.yaml的配置：

environment:
  sdk: ">=2.12.0 <3.0.0"
dependencies:
  flutter:
    sdk: flutter

  cupertino_icons: ^1.0.2

  m_loading: ^0.0.2

pub get的时候出现一下错误 Xcode's output: ↳ Error: Cannot run with sound null safety, because the following dependencies don't support null safety:

• package:m_loading

[samyzhh]

这个项目应该没有人维护了吧