Roll Flutter Engine from fb60ecf44c22 to 8611cb0ce32d (1 revision) (#134610)

https://github.com/flutter/engine/compare/fb60ecf44c22...8611cb0ce32d

2023-09-13 skia-flutter-autoroll@skia.org Roll Skia from 29e7723e1f8c to 2ec12c767ec7 (1 revision) (flutter/engine#45758)

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 bdero@google.com,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

-fb60ecf44c2217c82d4de94e96d95665e9dba5f6
+8611cb0ce32d50c4c2ab92d16d28de989cbf213f