Roll Packages from 8fbdf65d0235 to 21b5abba7958 (6 revisions) (#142224)

https://github.com/flutter/packages/compare/8fbdf65d0235...21b5abba7958

2024-01-24 pageli328@gmail.com Add rfw widgets (flutter/packages#5661)
2024-01-24 50643541+Mairramer@users.noreply.github.com [camera] add heif support image iOS (flutter/packages#4586)
2024-01-24 jsharp83@gmail.com [webview_flutter_android] Add javascript panel interface for android (flutter/packages#5796)
2024-01-24 43054281+camsim99@users.noreply.github.com [camerax] Wrap Android classes/methods required for implementing setting focus & exposure points and offset (flutter/packages#5659)
2024-01-24 49699333+dependabot[bot]@users.noreply.github.com Bump actions/upload-artifact from 4.2.0 to 4.3.0 (flutter/packages#5967)
2024-01-24 engine-flutter-autoroll@skia.org Roll Flutter from 5b673c28 to 19b06f4e (21 revisions) (flutter/packages#5968)

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:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

bin/internal/flutter_packages.version

-8fbdf65d0235edcc076c46c66c2522af3825faf5
+21b5abba7958ccc15080abcb83bc49b8ee13d2d4