Roll Flutter Engine from 6344b17a2e03 to 481684a6e276 (2 revisions) (#131118)

https://github.com/flutter/engine/compare/6344b17a2e03...481684a6e276

2023-07-22 skia-flutter-autoroll@skia.org Roll Fuchsia Mac SDK from rMFZIJYvVmXEBGCay... to UgZ9epS2Jkz7Yrymp... (flutter/engine#43922)
2023-07-22 skia-flutter-autoroll@skia.org Roll Skia from 80e101dc5813 to 85e8d8403b45 (1 revision) (flutter/engine#43921)

Also rolling transitive DEPS:
  fuchsia/sdk/core/mac-amd64 from rMFZIJYvVmXE to UgZ9epS2Jkz7

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://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

bin/internal/engine.version

-6344b17a2e030d5d226267026d7e899127ac4ca5
+481684a6e2768e480febdcc53972a21a517db1d4

bin/internal/fuchsia-mac.version

-rMFZIJYvVmXEBGCay-wjvn6m1nVIU-KymF2MIuEo6KkC
+UgZ9epS2Jkz7Yrymp9fnT2vZnmIUtBJdIuN2a54v_SIC