Roll Flutter Engine from d9b6245d3748 to dd620fcf9af7 (2 revisions) (#137803)

https://github.com/flutter/engine/compare/d9b6245d3748...dd620fcf9af7

2023-11-02 flar@google.com [Impeller] Deprecate the exposed Rect fields (flutter/engine#47592)
2023-11-02 skia-flutter-autoroll@skia.org Manual roll Dart SDK from e6df03a57636 to 3c45f68cd7c2 (4 revisions) (flutter/engine#47620)

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 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

-d9b6245d3748f046aa9999548f4408594dec2310
+dd620fcf9af72729d57565666cca09e52370eeb5