Roll Flutter Engine from 976edd5192d1 to a7a48a68e6f8 (3 revisions) (#138463)

https://github.com/flutter/engine/compare/976edd5192d1...a7a48a68e6f8

2023-11-15 skia-flutter-autoroll@skia.org Roll Skia from a701a64f1ba9 to 2f2c74633e0f (1 revision) (flutter/engine#48058)
2023-11-15 skia-flutter-autoroll@skia.org Roll Dart SDK from 6f1322227bdf to 65819963fb17 (2 revisions) (flutter/engine#48056)
2023-11-15 skia-flutter-autoroll@skia.org Roll Skia from 5778a54af88d to a701a64f1ba9 (1 revision) (flutter/engine#48055)

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 jonahwilliams@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

-976edd5192d1270105ca59384a49b1aa17181a03
+a7a48a68e6f870f9ffdf2bf3152c420f0086afb0