Roll Skia from 4135182b6a56 to ef4c093143d2 (2 revisions) (#46680)

https://skia.googlesource.com/skia.git/+log/4135182b6a56..ef4c093143d2

2023-10-09 nscobie@google.com Force RRectEffect to always use scale when in reduced shader mode
2023-10-09 robertphillips@google.com [graphite] Update remaining childless Blocks to be AddBlock-style

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC brianosman@google.com,chinmaygarde@google.com,johnstiles@google.com,rmistry@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Skia: https://bugs.chromium.org/p/skia/issues/entry
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

DEPS

@@ -18,7 +18,7 @@ vars = {
   'llvm_git': 'https://llvm.googlesource.com',
   # OCMock is for testing only so there is no google clone
   'ocmock_git': 'https://github.com/erikdoe/ocmock.git',
-  'skia_revision': '4135182b6a560c560d0efd51f039c3f3bdf94032',
+  'skia_revision': 'ef4c093143d22558d66cfd9e05cbe670eb3c3daa',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.

ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: 7ca130c40c6197c00e37662a72fc0fe5
+Signature: b6e704f8713eabcd3b49cfe7b8e24d6e
 
 ====================================================================================================
 LIBRARY: etc1