Roll Flutter Engine from e2f324beac3b to 5a12de1beab7 (1 revision) (#145578)

https://github.com/flutter/engine/compare/e2f324beac3b...5a12de1beab7

2024-03-21 41930132+hellohuanlin@users.noreply.github.com [ios][platform_view][performance] overlay intersection (flutter/engine#50637)

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://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

-e2f324beac3b7f7c11906cebba2991a731fa73c8
+5a12de1beab71c44692e7b12e7fdf3f5f3702f06