Roll Flutter Engine from 539ad5b232a6 to 12122eac2820 (2 revisions) (#136619)

https://github.com/flutter/engine/compare/539ad5b232a6...12122eac2820

2023-10-16 leroux_bruno@yahoo.fr Reland - [Android] Add support for text processing actions (flutter/engine#46817)
2023-10-16 dkwingsmt@users.noreply.github.com Revert "Reland: Enforce the rule of calling FlutterView.Render (#45300)" (flutter/engine#46919)

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

-539ad5b232a67292b9c79ddb6fd8a487e971955c
+12122eac2820d28a36c8f5f8c22a0efa6365832d