Roll Skia from 401c85ab1e21 to b8133dda3a8c (4 revisions) (flutter/engine#43853)

https://skia.googlesource.com/skia.git/+log/401c85ab1e21..b8133dda3a8c

2023-07-20 johnstiles@google.com Refactor GetConstantValueOrNullForVariable logic.
2023-07-20 brianosman@google.com Remove kBGR_888x_SkColorType
2023-07-20 johnstiles@google.com Remove inaccurate comment in YUVA pixmaps.
2023-07-20 ramasamy.si@zohocorp.com Fix crash in skparagraph's visit function

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 bdero@google.com,brianosman@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': '401c85ab1e21caf65a1b33afa9ff43b7ed7eb0f2',
+  'skia_revision': 'b8133dda3a8c70d3d8a814d37448af506ad07805',
 
   # 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: 9bab70683e0f7122e11999d13bb4845d
+Signature: 3e431842ed9034f377ce9d9bd6c5f27e
 
 ====================================================================================================
 LIBRARY: etc1