Update dependency flutter to v3.44.6

[renovate]

This PR contains the following updates:

Package	Update	Change
flutter (source)	patch	3.44.4 → 3.44.6

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Release Notes

flutter/flutter (flutter)

v3.44.6

Compare Source

v3.44.5

Compare Source

• flutter/188718 When building Flutter Android apps and add-to-app modules using AGP < 9 with KGP, the tool incorrectly logs Built-in Kotlin migration warnings.
• flutter/186810 flutter/187388 flutter/187553 When building Android app bundles using flavors, or with an old app template combined with a plugin coming alphabetically before app, fixes problems with failing to include libapp.so in the produced app bundle.
• flutter/188035 When rendering text with shadows, the shadows would appear elsewhere on the screen, separate from the text.
• flutter/187237 Fixes a crash that can happen during app shutdown or rotation on some Android devices using Impeller/Vulkan with HCPP.

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⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

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The artifact failure details are included below:

File name: pubspec.lock

Command failed: install-tool flutter 3.44.6