Roll Skia from d607cbb0db78 to 773765ca1dd2 (7 revisions) (flutter#42624)

https://skia.googlesource.com/skia.git/+log/d607cbb0db78..773765ca1dd2

2023-06-07 drott@chromium.org [Fontations] Support makeClone() for variations
2023-06-07 johnstiles@google.com Demonstrate function-parameter assignment issue in unit test.
2023-06-07 johnstiles@google.com Add unit tests to WGSL that rely on dead-return synthesis.
2023-06-07 johnstiles@google.com Add trailing `return` to functions that lack an unconditional return.
2023-06-07 skia-autoroll@skia-public.iam.gserviceaccount.com Roll vulkan-deps from c520912239f0 to 5c35de42bbc6 (2 revisions)
2023-06-07 johnstiles@google.com Fix test disable for OutParamsDoubleSwizzle.
2023-06-07 kjlubick@google.com Remove some spaces from the gainmap sksl

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 borenet@google.com,brianosman@google.com,jacksongardner@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': 'd607cbb0db78764498d81ab3d354a99c80eea115',
+  'skia_revision': '773765ca1dd2fd0a958736563122616425a1beff',
 
   # 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: 48d003e3d30817e13193699431edff1a
+Signature: 79d5cc9a9596e4aa67d091bcf39348ae
 
 ====================================================================================================
 LIBRARY: etc1