Roll Flutter Engine from 997d3dfa1e74 to 2140942444ea (4 revisions) (#140171)

https://github.com/flutter/engine/compare/997d3dfa1e74...2140942444ea

2023-12-14 skia-flutter-autoroll@skia.org Roll Skia from 5353de0c25b9 to 92935b91193a (1 revision) (flutter/engine#49044)
2023-12-14 jason-simmons@users.noreply.github.com Reland manual roll of Dart SDK from 82c4571bb2de to a677378ae254 (flutter/engine#49034)
2023-12-14 737941+loic-sharma@users.noreply.github.com [Windows] Remove header guard from generated key map (flutter/engine#48993)
2023-12-14 flar@google.com [Impeller] Round rects with circular ends should not generate ellipses (flutter/engine#49021)

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 jsimmons@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

-997d3dfa1e74f13d67cf5745ca914de49b25cff5
+2140942444eaf3c30c099497732af58fd6328c4b