Roll Flutter Engine from dffc480a2bbf to 00f20fbab038 (1 revision) (#126871)

https://github.com/flutter/engine/compare/dffc480a2bbf...00f20fbab038

2023-05-15 30870216+gaaclarke@users.noreply.github.com Include SkRect in rtree. (flutter/engine#42050)

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 aaclarke@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

-dffc480a2bbf90634cb29312568079b06c9dc4da
+00f20fbab038314dafa6a4f1f280df3bdc5fc91a