Roll Flutter Engine from 704ef3399012 to 2b31ad2fb819 (1 revision) (#141937)

https://github.com/flutter/engine/compare/704ef3399012...2b31ad2fb819

2024-01-20 skia-flutter-autoroll@skia.org Roll Skia from 3cac1efbdd7a to c42ac527ff0e (1 revision) (flutter/engine#49921)

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 jonahwilliams@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

-704ef33990121a29b80a66227cbd29c61aa0d75a
+2b31ad2fb8192127cce876463520fae7ac88356f