Roll Skia from fd317812bd27 to 56ce5bb201c6 (4 revisions) (flutter/engine#46096)

https://skia.googlesource.com/skia.git/+log/fd317812bd27..56ce5bb201c6

2023-09-20 drott@chromium.org [Fontations] Test path equivalence for a set of test fonts and strings
2023-09-20 johnstiles@google.com Migrate NVIDIA test disables into SkSLTest.cpp.
2023-09-20 brianosman@google.com [graphite] Adjust the working context inside working format color filter
2023-09-20 robertphillips@google.com [graphite] Add a PaintOption class to the precompilation system

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,jonahwilliams@google.com,rmistry@google.com,tdenniston@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': 'fd317812bd27da05c3b7f50dd5fbcdcf2fd488e6',
+  'skia_revision': '56ce5bb201c697296b2fb68156da92ae182a1cb6',
 
   # 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: 75e2d4355af8eede9cb5aa87ec7490d6
+Signature: 8ce2b368698cb8ef1488f85d86dbeb8e
 
 ====================================================================================================
 LIBRARY: etc1