Roll Flutter Engine from b642e4f4dffa to 9d06c176cf98 (2 revisions) (#135304)

https://github.com/flutter/engine/compare/b642e4f4dffa...9d06c176cf98

2023-09-22 skia-flutter-autoroll@skia.org Roll Dart SDK from 6bde93a6e56f to 4ddff752a6b0 (1 revision) (flutter/engine#46193)
2023-09-22 whesse@google.com Re-add package tar to DEPS (flutter/engine#46190)

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 jonahwilliams@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

-b642e4f4dffa6154c8198f80cf01cb1c08ef51a7
+9d06c176cf981771f9d56b04c3f4a979d82a0025