Roll Packages from 9b88dbc53992 to 6701c9e61804 (3 revisions) (#144772)

https://github.com/flutter/packages/compare/9b88dbc53992...6701c9e61804

2024-03-06 tugorez@users.noreply.github.com [rfw] Add support for widget builders (flutter/packages#5907)
2024-03-06 gabriel@terwesten.net [in_app_purchase_storekit] Handle translation of errors nested in dictionaries (flutter/packages#6277)
2024-03-06 engine-flutter-autoroll@skia.org Roll Flutter from 3b5a2ecf to 8f84f3f3 (18 revisions) (flutter/packages#6276)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-packages-flutter-autoroll
Please CC flutter-ecosystem@google.com,rmistry@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:
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bin/internal/flutter_packages.version

-9b88dbc539927fa0f4c8ae9aa8792043ecd0beed
+6701c9e618041574cf4cc53cb028a38de8322b53