Update dependency flutter to v3.38.9

[renovate]

This PR contains the following updates:

Package	Update	Change
flutter (source)	patch	3.38.7 → 3.38.9

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Release Notes

flutter/flutter (flutter)

v3.38.9

Compare Source

• flutter/181568 Update Dart to 3.10.8.

v3.38.8

Compare Source

• flutter/178151 - flutter run -d chrome may crash with a DartDevelopmentServiceException when the application shuts down during the startup sequence.

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Configuration

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