Roll Flutter Engine from e6b8292705a8 to 987b621eac4e (1 revision) (#129863)

https://github.com/flutter/engine/compare/e6b8292705a8...987b621eac4e

2023-07-01 skia-flutter-autoroll@skia.org Roll Skia from 2d05e3ec6b67 to ceaeef84b8a3 (1 revision) (flutter/engine#43355)

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://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

-e6b8292705a832a56ab31b13fd819030070962c0
+987b621eac4e1cbe12894d35127e3e80869591f2