Roll Skia from a39421eb8d7b to 8ed969b60e98 (6 revisions) (flutter#43431)

https://skia.googlesource.com/skia.git/+log/a39421eb8d7b..8ed969b60e98

2023-07-05 herb@google.com Pass up remove failure in GrTrangulator
2023-07-05 brianosman@google.com Don't fold layer alpha into draws that cover more than once
2023-07-05 brianosman@google.com Fix crash when adding mips to serialized image that fails to decode
2023-07-05 lovisolo@google.com [canvaskit] compile_gm.sh: Ignore non-test C++ files in //gm directory.
2023-07-05 nicolettep@google.com [graphite] Remove lsan disabler from VulkanGraphicsPipeline
2023-07-05 brianosman@google.com Remove unused experimental SkRecord optimization code

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 aaclarke@google.com,brianosman@google.com,jamesgk@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

Author: skia-flutter-autoroll

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': 'a39421eb8d7b6edaf448ad2c419722ee60c26551',
+  'skia_revision': '8ed969b60e98ce250a256a26fcab9a11ec73b34a',
 
   # 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: 7ed8757c158e62e4fa35c1c86f391e6e
+Signature: 79dbc1d43a5ae28c3d259eebcc7ee7a3
 
 ====================================================================================================
 LIBRARY: etc1