Roll Flutter Engine from 96604392231a to c49b861832d3 (3 revisions) (#139595)

https://github.com/flutter/engine/compare/96604392231a...c49b861832d3

2023-12-05 chinmaygarde@google.com Avoid non-const sizes in VLAs. (flutter/engine#48693)
2023-12-05 jonahwilliams@google.com [Impeller] Prefer moving vertex buffer, place on command instead of binding object. (flutter/engine#48630)
2023-12-05 skia-flutter-autoroll@skia.org Roll Skia from c759bbf16310 to 5f54e9f84cff (3 revisions) (flutter/engine#48692)

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

-96604392231a1b03662cd480d62935cf25ba9d32
+c49b861832d3db6a068b0d41b49b4927f2108ed3