Update dependency flutter to v3.38.3

[renovate]

This PR contains the following updates:

Package	Update	Change
flutter (source)	patch	3.38.1 -> 3.38.3

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Release Notes

flutter/flutter (flutter)

v3.38.3

Compare Source

v3.38.2

Compare Source

• flutter/178472 Widget preview command can crash on exit if in the middle of analyzing changes to a Dart file.
• flutter/178452 Flutter fails to build on iOS with error message: "Improperly formatted define flag" in add-to-app scenarios.
• flutter/178486 When running flutter widget-preview start with Flutter Web disabled, an exception is thrown and the widget previewer fails to start.
• flutter/178317 Running flutter pub get can crash the widget previewer when plugin dependencies are added or updated.
• flutter/178318 Certain flutter crash scenarios can result in multiple crash reports being submitted for a single process crash.
• flutter/176399 Visual Studio 2026 is not supported when compiling Windows desktop applications.
• flutter/175058 The widget previewer fails to start if flutter pub get has not been run in the target project.
• flutter/178421 When debugging from an IDE with a physical iOS 26 device, IDE installs an app but hangs on a white screen during launching.

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