Roll Flutter Engine from 046ec85dffc6 to 77b952f3add4 (1 revision) (#138377)

https://github.com/flutter/engine/compare/046ec85dffc6...77b952f3add4

2023-11-13 mdebbar@google.com [web] Cleanup touch and mouse event adapters (flutter/engine#43697)

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://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

-046ec85dffc6cfec91c0a1b8cb053aea980c8805
+77b952f3add48f8050267329e230875dfce75032