Update dependency flutter to v3.47.7

[renovate]

This PR contains the following updates:

Package	Update	Change
flutter (source)	patch	3.47.6 → 3.47.7

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Release Notes

flutter/flutter (flutter)

v3.47.7

Compare Source

• flutter/182604 When an OverlayPortal is displayed on iOS, accessibility frames are shrunk by the device pixel ratio and anchored to the top-left, so VoiceOver focus and XCUITest taps miss the visible controls.
• flutter/100946 When using VoiceOver on iOS with a ReorderableListView, Semantics focus is incorrectly shifted to the top left of the screen.

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