Roll Flutter Engine from 4a603aaff32e to c4396f9f602f (2 revisions) (#125007)

https://github.com/flutter/engine/compare/4a603aaff32e...c4396f9f602f

2023-04-17 zanderso@users.noreply.github.com Roll impeller-cmake-example to 58042bb24833a3cbd615ad082b1d17daef42d097 (flutter/engine#41280)
2023-04-17 jacksongardner@google.com Reland ui_web files in sky_engine (flutter/engine#41169)

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 jacksongardner@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

-4a603aaff32ec1bef709bcb9626a3b5b5ee3921b
+c4396f9f602f7fb1dcc0f3160c9ab51bcd2aea1e