'Flutter build error: Dart 2.13.1 is incompatible with your dependencies' SDK constraints

I am relatively new to Flutter, and don't seem to be able to figure this out.

Here is my pubspec.yaml:

name: app
version: 1.0.0+1
environment:
  sdk: ">=2.16.0-80.1.beta <3.0.0"
dependencies:
  flutter:
    sdk: flutter
  cupertino_icons: ^1.0.2
  flutter_login: ^3.1.0
  font_awesome_flutter: ^9.2.0
  flutter_secure_storage: ^5.0.2
  flutter_bloc: ^8.0.1
  shared_preferences: ^2.0.12
  equatable: ^2.0.3
  json_annotation: ^4.4.0
dev_dependencies:
  flutter_test:
    sdk: flutter
  flutter_lints: ^1.0.0
  build_runner: ^2.1.7
flutter:
  uses-material-design: true

I did of course try to run $(flutter) pub get, update flutter channel to the latest master and dev, run $flutter packages pub run build_runner watch, but to no avail...

The dev channel in particular lists "Dart 2.16.0 (build 2.16.0-134.1.beta)" as a dependency tool, but I still get the same compile error.

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'Flutter build error: Dart 2.13.1 is incompatible with your dependencies' SDK constraints

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