Roll Flutter Engine from 602b5131ee4d to d6a48e9963df (6 revisions) (#137180)

https://github.com/flutter/engine/compare/602b5131ee4d...d6a48e9963df

2023-10-24 jonahwilliams@google.com [Impeller] Allocate exact descriptor count, populate in one go. (flutter/engine#47200)
2023-10-24 47866232+chunhtai@users.noreply.github.com [Impeller] Curve components in stroke path use start directions as their initial offsets (flutter/engine#46203)
2023-10-24 skia-flutter-autoroll@skia.org Roll Fuchsia Mac SDK from OUWiWfUxyMyDOlEfA... to YqSO1OByhoexFJSCr... (flutter/engine#47273)
2023-10-24 matanlurey@users.noreply.github.com [Impeller] Enable MSAA for OpenGLES: Take 2. (flutter/engine#47030)
2023-10-24 skia-flutter-autoroll@skia.org Manual roll Dart SDK from 901e92d10627 to 360370ff93b0 (3 revisions) (flutter/engine#47271)
2023-10-24 skia-flutter-autoroll@skia.org Roll Dart SDK from 901e92d10627 to 360370ff93b0 (3 revisions) (flutter/engine#47269)

Also rolling transitive DEPS:
  fuchsia/sdk/core/mac-amd64 from OUWiWfUxyMyD to YqSO1OByhoex

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 aaclarke@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

-602b5131ee4d1e24a23de8033bd630bba2319078
+d6a48e9963df7b5afa6b07d4acad0b72d964e7ff

bin/internal/fuchsia-mac.version

-OUWiWfUxyMyDOlEfAefIKTeeJolE4dFwd-Ree_4Xh7IC
+YqSO1OByhoexFJSCrIkAG8x9jbNXS_7gjuN_KRkqYJ8C