Roll Flutter Engine from 21aed05ad751 to 6975ee1b6de7 (1 revision) (#132543)

https://github.com/flutter/engine/compare/21aed05ad751...6975ee1b6de7

2023-08-15 skia-flutter-autoroll@skia.org Roll Skia from f636188df4e2 to 022415d74e73 (2 revisions) (flutter/engine#44706)

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 chinmaygarde@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

-21aed05ad75150ff1420893a28b2f45326103351
+6975ee1b6de7afc31d713b0b073ace129eb89b56