Roll Skia from cd75e4672719 to a247f8cc2a66 (1 revision) (flutter/engine#51840)

https://skia.googlesource.com/skia.git/+log/cd75e4672719..a247f8cc2a66

2024-04-02 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Dawn from 591c327b3bb5 to 8f8193a59b53 (12 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 brianosman@google.com,jacksongardner@google.com,kjlubick@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://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

@@ -14,7 +14,7 @@ vars = {
   'flutter_git': 'https://flutter.googlesource.com',
   'skia_git': 'https://skia.googlesource.com',
   'llvm_git': 'https://llvm.googlesource.com',
-  'skia_revision': 'cd75e467271917846f2b53277028168255e4f485',
+  'skia_revision': 'a247f8cc2a6687b5cadb0b4a4f468cea2a7d15d3',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.