Roll Flutter Engine from 6e0ad1b16698 to 273a604d0854 (1 revision) (#139647)

https://github.com/flutter/engine/compare/6e0ad1b16698...273a604d0854

2023-12-06 skia-flutter-autoroll@skia.org Roll Dart SDK from 9e54241e915a to 691e4650ce91 (1 revision) (flutter/engine#48725)

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 chinmaygarde@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

-6e0ad1b1669838922d113d91bc73c1c290b500d1
+273a604d0854e70fcde2b2bd4d744de99602da08