Update dependency flutter to v3.38.6

[renovate]

This PR contains the following updates:

Package	Update	Change
flutter (source)	patch	3.38.4 → 3.38.6

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Release Notes

flutter/flutter (flutter)

v3.38.6

Compare Source

v3.38.5

Compare Source

• flutter/179700 Update dart to 3.10.4.

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Configuration

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