Roll Flutter Engine from 9796817fb6e2 to e4fc0c4e2b97 (1 revision) (#136993)

https://github.com/flutter/engine/compare/9796817fb6e2...e4fc0c4e2b97

2023-10-20 skia-flutter-autoroll@skia.org Roll Skia from cf2131f85d57 to e8c78601ecf6 (1 revision) (flutter/engine#47178)

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 jimgraham@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://issues.skia.org/issues/new?component=1389291&template=1850622

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

bin/internal/engine.version

-9796817fb6e2790c15d5b52e442225e6e77240d3
+e4fc0c4e2b970e5dbb983c5a986f81679037ffc1