Roll Flutter Engine from 247971f4d7e6 to b7f7a841c722 (2 revisions) (#144090)

https://github.com/flutter/engine/compare/247971f4d7e6...b7f7a841c722

2024-02-24 skia-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from sO-oG6KoeFlPK2WLR... to Oac3MZ5VgZ9g3Q3cL... (flutter/engine#50946)
2024-02-24 dnfield@google.com Avoid reloading font collection for spawned engines with compatible asset managers (flutter/engine#50897)

Also rolling transitive DEPS:
  fuchsia/sdk/core/linux-amd64 from sO-oG6KoeFlP to Oac3MZ5VgZ9g

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 jimgraham@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://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/engine.version

-247971f4d7e609cebf31e8c9c8426927af8855fb
+b7f7a841c7225eaab1841356989bc9de8d321c6e

bin/internal/fuchsia-linux.version

-sO-oG6KoeFlPK2WLRbz5aMNglpiCFKq50vamqEE7LlkC
+Oac3MZ5VgZ9g3Q3cL1r1-c5XYLHhQV1jy_WNoZE1Cs8C