运行 flutter doctor 时出现此错误
Building flutter tool...
The current Dart SDK version is 2.10.0-4.0.dev.flutter-06cb010247.
Because flutter_tools depends on collection >=1.15.0-nnbd <1.15.0-nullsafety.2 which requires SDK version >=2.9.0-18.0 <=2.9.10, version
solving failed.
Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds... (9 tries left)
The current Dart SDK version is 2.10.0-4.0.dev.flutter-06cb010247.
我已经尝试了这个建议的解决方案，但我得到了与上面完全相同的错误： https://stackoverflow.com/a/58283307/12671198
我需要降级我的 Dart SDK 吗？如果是这样，这是如何完成的？