Roll Flutter Engine from 4219c72ac8f0 to db23c3fbe0b0 (4 revisions) (#124200)

https://github.com/flutter/engine/compare/4219c72ac8f0...db23c3fbe0b0

2023-04-05 bdero@google.com [Impeller] Snap glyph positions to screen
space pixels and map UVs correctly (flutter/engine#40912)
2023-04-05 chris@bracken.jp [macOS] Handle termination in
FlutterAppDelegate (flutter/engine#40929)
2023-04-05 skia-flutter-autoroll@skia.org Manual roll Dart SDK from
f97b9d9b2f64 to beff36793081 (1 revision) (flutter/engine#40934)
2023-04-05 chillers@google.com Revert "[web] remove obsolete object
caches; simplify native object management" (flutter/engine#40937)

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 jonahwilliams@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://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

bin/internal/engine.version

-4219c72ac8f00c53dcb0714c42c67ba8e29384f0
+db23c3fbe0b0301f460714291a3e5fda50d6e349