Roll Flutter Engine from 3ccf66bed335 to a5d446da5495 (2 revisions) (#141252)

https://github.com/flutter/engine/compare/3ccf66bed335...a5d446da5495

2024-01-10 skia-flutter-autoroll@skia.org Roll Dart SDK from d4b1939dffa6 to efd053daa2a6 (1 revision) (flutter/engine#49666)
2024-01-10 skia-flutter-autoroll@skia.org Roll Skia from ae30afc7b79a to 51a0ad17b147 (1 revision) (flutter/engine#49665)

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

-3ccf66bed3352769372798640c5a3728946935ac
+a5d446da5495d8d9c2c54554bbd07ca3f23e5595