The most recent roll was reverted in flutter/engine#44989 due to many new analyzer lints that were surfaced in the attempt to roll to the framework: https://ci.chromium.org/ui/p/flutter/builders/try/Linux%20analyze/62841/overview.

These are apparently due to https://dart.googlesource.com/sdk.git/+/8c2f088481e90949dc04f532af8600b23138ff63

cc @kallentu