[CP] Fix null-check error in DWDS when debugging Flutter widgets from VS Code (stable)

[elliette]

Issue Link

dart-lang/webdev#2297

Target

stable

PR Link

#140711

Changelog Description

Updates DWDS (dependency of flutter_tools) to a hotfix release version. This hotfix release version is identical to the current DWDS version in Flutter stable, except it includes a fix for a null-cast error. See https://pub.dev/packages/dwds/versions/21.0.0+1/changelog

Impacted Users

Flutter developers debugging Flutter widgets from VS Code

Impact Description

Null-cast error displayed in VS Code when a developer tries to inspect a widget's state or build context, see dart-lang/webdev#2297

Workaround

No, it doesn't seem like the proposed workaround is working for all users, see comments after dart-lang/webdev#2297 (comment)

Risk

low

Test Coverage

yes

Validation Steps

Inspect a widget's state or build context from VS Code and verify that you don't see a null-cast error

[github-actions]

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