iOS 16.6 performance regression

[Kevin Chisholm]

We are aware of a performance regression affecting Flutter apps running on iOS version 16.6 (https://github.com/flutter/flutter/issues/131319). Previous iOS versions and other platforms are not impacted. The issue is resolved in Flutter 3.13. For those not ready to upgrade to 3.13 yet, we are working on backporting the fix to the 3.10 release series.