Roll Flutter Engine from a56f346dbbf9 to ef2cf86c35a5 (1 revision) (#141456)

https://github.com/flutter/engine/compare/a56f346dbbf9...ef2cf86c35a5

2024-01-12 skia-flutter-autoroll@skia.org Roll Skia from 7484d4a2514e to e04ca400c5d8 (2 revisions) (flutter/engine#49759)

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

-a56f346dbbf95175de0e63ec47cec938787c67c1
+ef2cf86c35a5c97771beb035f16f54af7acdb224