Update dependency flutter to v3.29.3

[renovate]

This PR contains the following updates:

Package	Update	Change
flutter (source)	patch	3.29.2 -> 3.29.3

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Release Notes

flutter/flutter (flutter)

v3.29.3

Compare Source

• flutter/165818 - Unset GIT_DIR to enable flutter tool calls in githooks.
• flutter/163421 - Impeller,
  Android, Fixes Android Emulator crash when navigating to routes with backdrop
  blurs.
• flutter/165166 - Impeller, All platforms, Text that is scaled over 48x renders incorrectly.
• flutter/163627 - Fix issue where placeholder types in ARB localizations weren't used for type inference, causing a possible type mismatch with the placeholder field defined in the template.
• flutter/165166 - Update CI configurations and tests to use Xcode 16 and iOS 18 simulator.
• flutter/161466 - Hot restart can hang on all platforms if "Pause on Unhandled Exceptions" is enabled by the debugger and a call to compute or Isolate.run has not completed.

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