Roll Skia from b2ba6e1d8c0e to 620de5ac9f6b (2 revisions) (flutter#43437)

https://skia.googlesource.com/skia.git/+log/b2ba6e1d8c0e..620de5ac9f6b

2023-07-06 [email protected] Roll vulkan-deps from d0a05b6ca656 to 654dff5c995f (3 revisions)
2023-07-06 [email protected] Roll ANGLE from b41c42f44e82 to d2d44dda1caa (9 revisions)

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 [email protected],[email protected],[email protected],[email protected] 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': 'b2ba6e1d8c0ee389b207a233471966c1a8d77f56',
+  'skia_revision': '620de5ac9f6b9d47862dd1f2a09dc595c812ba87',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.