Roll Flutter Engine from 1f1071d3f5ba to 1917fa95ea55 (2 revisions) (#133739)

https://github.com/flutter/engine/compare/1f1071d3f5ba...1917fa95ea55

2023-08-31 skia-flutter-autoroll@skia.org Roll Skia from adaad6716b2c to 676a16152834 (1 revision) (flutter/engine#45314)
2023-08-31 matej.knopp@gmail.com [macOS] Implement unobstructed platform views (flutter/engine#42960)

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 aaclarke@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

-1f1071d3f5ba76cdae2c575aae6385725a0236f6
+1917fa95ea5545eae2284b4d200041593996c07a