Roll Flutter Engine from 47d1a045d140 to a2af0c6965be (1 revision) (#134375)

https://github.com/flutter/engine/compare/47d1a045d140...a2af0c6965be

2023-09-10 skia-flutter-autoroll@skia.org Roll Skia from 1bb0f15f2cff to 4eea73a072d3 (1 revision) (flutter/engine#45623)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC rmistry@google.com,zra@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

bin/internal/engine.version

-47d1a045d1407325b80694e4b3690fb516842d52
+a2af0c6965be496b0733072de56350c8b814ecfd