Roll Packages from 252bb33ad366 to df2ba94faea6 (5 revisions) (#191578)

https://github.com/flutter/packages/compare/252bb33ad366...df2ba94faea6

2026-08-24 49699333+dependabot[bot]@users.noreply.github.com
[dependabot]: Bump org.json:json from 20260719 to 20260814 in
/packages/in_app_purchase/in_app_purchase_android/example/android/app
(flutter/packages#12570)
2026-08-22 engine-flutter-autoroll@skia.org Roll Flutter from
c2437523d308 to 65c9a8dc60bc (195 revisions) (flutter/packages#12554)
2026-08-21 tarrinneal@gmail.com [pigeon] add modern concurrency support
(flutter/packages#12382)
2026-08-21 32538273+ValentinVignal@users.noreply.github.com
[material_ui] Remove no-shuffle in scrollbar test
(flutter/packages#12527)
2026-08-21 32538273+ValentinVignal@users.noreply.github.com
[material_ui] Remove no-shuffle from dropdown test
(flutter/packages#12528)

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 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