Roll Flutter Engine from 1e821961e96a to ffda7e3cfc7f (2 revisions) (#133523)

https://github.com/flutter/engine/compare/1e821961e96a...ffda7e3cfc7f

2023-08-29 skia-flutter-autoroll@skia.org Roll Fuchsia Mac SDK from u44zzvYd85WSDMpS3... to 68DESTl_q6I45UJyb... (flutter/engine#45197)
2023-08-29 matanlurey@users.noreply.github.com Rename `instrumentation` to `stopwatch` (flutter/engine#45196)

Also rolling transitive DEPS:
  fuchsia/sdk/core/mac-amd64 from u44zzvYd85WS to 68DESTl_q6I4

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 jimgraham@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

-1e821961e96afab6aaa330a4c7561c2c5c43b692
+ffda7e3cfc7f7f63beea51bd28e2e2fb6e6ea946

bin/internal/fuchsia-mac.version

-u44zzvYd85WSDMpS3HByB6bT_uFdClQ4RtTDaYFpC40C
+68DESTl_q6I45UJybf_gTTh2BU9FCq4XHR0QuJo5RJEC