Roll Flutter Engine from ef86c9d84745 to 0a60a1d89664 (3 revisions) (#135893)

https://github.com/flutter/engine/compare/ef86c9d84745...0a60a1d89664

2023-10-03 49699333+dependabot[bot]@users.noreply.github.com Bump actions/setup-python from 4.7.0 to 4.7.1 (flutter/engine#46488)
2023-10-03 skia-flutter-autoroll@skia.org Roll Skia from 1ec5c024f61e to ef4abc18ef53 (2 revisions) (flutter/engine#46486)
2023-10-03 skia-flutter-autoroll@skia.org Roll Dart SDK from b121fbe079e8 to a4a29db16711 (1 revision) (flutter/engine#46487)

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 jacksongardner@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
diff --git a/bin/internal/engine.version b/bin/internal/engine.version
index 274bfb7..16923cb 100644
--- a/bin/internal/engine.version
+++ b/bin/internal/engine.version
@@ -1 +1 @@
-ef86c9d84745e0126a4c236056b047faadedc4c7
+0a60a1d8966435ab562e6e159624d7097c658139