Roll Skia from df1a7ccbdc97 to 48f959a857da (1 revision) (#49255)

https://skia.googlesource.com/skia.git/+log/df1a7ccbdc97..48f959a857da

2023-12-19 [email protected] Skia: Upgrade Go to 1.21.

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://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

@@ -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': 'df1a7ccbdc97cf8027896a88394417011ebb6ffd',
+  'skia_revision': '48f959a857da5f8ca7a75650a9a6dfc056366554',
 
   # 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: 04b1d408b00044b465074aed4d725638
+Signature: 23c6d2d2154c1e23f8daa99979bcf63e
 
 ====================================================================================================
 LIBRARY: etc1