Roll Flutter Engine from 3b156c8ce9bd to df1593e96a6b (2 revisions) (#140422)

https://github.com/flutter/engine/compare/3b156c8ce9bd...df1593e96a6b

2023-12-19 zanderso@users.noreply.github.com Rolls clang to 725656bdd885483c39f482a01ea25d67acf39c46 (flutter/engine#49248)
2023-12-19 aam@google.com Roll dart to 3.3.0-242.0.dev (flutter/engine#49239)

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

-3b156c8ce9bd398828b7dcbb4bbc8c4ab499f6a8
+df1593e96a6bf103e7908001daf7d9dd66b007ae