Update dependency flutter to v3.35.6

[renovate]

This PR contains the following updates:

Package	Update	Change
flutter (source)	patch	3.35.5 -> 3.35.6

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Release Notes

flutter/flutter (flutter)

v3.35.6

Compare Source

• flutter/175669 flutter analyze --suggestions supports versions up to Java 25, Gradle 9 and AGP 9, Kotlin 2.2.20.
• flutter/172624 Fixes an issue that could result in a corrupt pipeline cache when using the Impeller Vulkan back end.

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