Update dependency flutter to v3.44.3

[renovate]

This PR contains the following updates:

Package	Update	Change
flutter (source)	patch	3.44.1 → 3.44.3

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Release Notes

flutter/flutter (flutter)

v3.44.3

Compare Source

v3.44.2

Compare Source

• flutter/187322 When DTD connection is lost or fails at startup during widget-preview on all platforms, the tool crashes with unhandled exceptions instead of exiting gracefully.
• flutter/186723 When Android apps switch from any SystemUiMode to edge-to-edge, the system bars unexpectedly remain invisible.
• flutter/186054 When building an iOS or macOS app with Swift Package Manager enabled, remote package dependencies may fail to download.
• flutter/185775 When building for non-iOS or macOS apps, Swift Package Manager warnings may appear.

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