Roll Flutter Engine from e9f1696e5060 to 2b5961cbc40d (1 revision) (#134424)

https://github.com/flutter/engine/compare/e9f1696e5060...2b5961cbc40d

2023-09-11 skia-flutter-autoroll@skia.org Roll Skia from 4c50e0870461 to 787b61f00100 (1 revision) (flutter/engine#45639)

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

-e9f1696e50608e744c96ed2becc138a0322957bf
+2b5961cbc40d0be5f455642e06956f19cfd1d4fe