Roll Skia from 86df55671e1d to 4f9a1a464eb1 (1 revision) (flutter/engine#47262)

https://skia.googlesource.com/skia.git/+log/86df55671e1d..4f9a1a464eb1

2023-10-24 ccameron@chromium.org SkJpegMultiPictureParameters: Fix null dereference

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,rmistry@google.com,robertphillips@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://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

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': '86df55671e1d59652877412aa94c1bf092016662',
+  'skia_revision': '4f9a1a464eb18453c492afd6b09ff3c9e1cbc21f',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.

engine/src/flutter/ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: 19448052b303aeb0b171997c4d0a9bc8
+Signature: 6fab7621b5a0ac68c98d6b93b5039b3f
 
 ====================================================================================================
 LIBRARY: etc1