Roll Flutter Engine from bd175aa5e0b6 to b2a9ce88a19e (1 revision) (#140986)

https://github.com/flutter/engine/compare/bd175aa5e0b6...b2a9ce88a19e

2024-01-04 skia-flutter-autoroll@skia.org Roll Skia from 48ba1246efdf to dab831e8dcec (1 revision) (flutter/engine#49538)

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 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

-bd175aa5e0b6512d526c3a4538779ccc97be9534
+b2a9ce88a19e46ba1725c83165ed972b1c4fa8a3