Roll Flutter Engine from df1593e96a6b to 5279873a8635 (2 revisions) (#140428)

https://github.com/flutter/engine/compare/df1593e96a6b...5279873a8635

2023-12-19 skia-flutter-autoroll@skia.org Roll Dart SDK from e8cdc554c598 to 4c59838945d9 (2 revisions) (flutter/engine#49261)
2023-12-19 flar@google.com Make sure run_tests.py runs dart tests on Skia (flutter/engine#49260)

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

-df1593e96a6bf103e7908001daf7d9dd66b007ae
+5279873a86358309190ede426b833d1e4c7d7eb1