version solving fails for flutter_tool

[goderbauer]

From running the flutter tool locally at tip of tree:

Resolving dependencies... (1.8s)
Because flutter_tools depends on web_socket_channel 2.4.2 which doesn't match
  any versions, version solving failed.


You can try the following suggestion to make the pubspec resolve:
* Consider downgrading your constraint on web_socket_channel: dart pub add web_socket_channel:^2.4.1
Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds... (9 tries left)

Looks like web_socket_channel was bumped to 2.4.2 in #140979, but that version does not exist (anymore?) on pub: https://pub.dev/packages/web_socket_channel

[goderbauer]

cc @christopherfujino

[goderbauer]

Looks like this is also the reason for the tree redness: https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8759717247430832049/+/u/flutter_config_--clear-features/stdout

[goderbauer]

https://pub.dev/packages/web_socket_channel/versions says at the very bottom that v2.4.2 was retracted.

[goderbauer]

Some context about the retracted version is at dart-lang/web_socket_channel#318 (comment).

[goderbauer]

This also broke the packages tree: https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8759714323922531057/+/u/flutter_config_--clear-features/stdout (cc @stuartmorgan)

[piedcipher]

faced this while doing flutter channel master.

tried a hack by going to flutter directory and doing git checkout master && git pull origin master. then when I opened the SDK in vscode it auto-downloaded the upgrade.

[christopherfujino]

This was resolved in #141040

[github-actions]

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