Roll Flutter Engine from 5306213d9d19 to 21f055f7d8d0 (3 revisions) (#138111)

https://github.com/flutter/engine/compare/5306213d9d19...21f055f7d8d0

2023-11-08 98614782+auto-submit[bot]@users.noreply.github.com Reverts "[Impeller] add support for Skia concept of RRect::isSimple needed for DL dispatching" (flutter/engine#47821)
2023-11-08 skia-flutter-autoroll@skia.org Roll Skia from fb69e696dc45 to e2b8ebe16203 (4 revisions) (flutter/engine#47815)
2023-11-08 flar@google.com [Impeller] add support for Skia concept of RRect::isSimple needed for DL dispatching (flutter/engine#47736)

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://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

-5306213d9d19a303eaf40e04bb07fa8de8c84f62
+21f055f7d8d07f723621ff76fb973cb772ea4f1b