Roll Skia from ad3c9f203f4e to a6c905943fe6 (1 revision) (#53288)

https://skia.googlesource.com/skia.git/+log/ad3c9f203f4e..a6c905943fe6

2024-06-08 skia-autoroll@skia-public.iam.gserviceaccount.com Roll vulkan-deps from 0a23ed309d21 to 70cb979fbdae (7 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,jmbetancourt@google.com,matanl@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

Author: skia-flutter-autoroll

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': 'ad3c9f203f4e65d0070b1257f40479563e416c46',
+  'skia_revision': 'a6c905943fe61b0b87be49f24b78fe7ec2012f23',
 
   # WARNING: DO NOT EDIT canvaskit_cipd_instance MANUALLY
   # See `lib/web_ui/README.md` for how to roll CanvasKit to a new version.