Roll Flutter Engine from ef4ce9294299 to d9b6245d3748 (2 revisions) (#137799)

https://github.com/flutter/engine/compare/ef4ce9294299...d9b6245d3748

2023-11-02 skia-flutter-autoroll@skia.org Roll Skia from 66e06117294e to 86d15e651ae0 (1 revision) (flutter/engine#47619)
2023-11-02 skia-flutter-autoroll@skia.org Roll Skia from 94000281b7d6 to 66e06117294e (1 revision) (flutter/engine#47616)

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://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

-ef4ce929429979de5b63a4c64623399b9443dbe3
+d9b6245d3748f046aa9999548f4408594dec2310