Roll Skia from b522808eb0af to 20108acef7d2 (3 revisions) (flutter/engine#44079)

https://skia.googlesource.com/skia.git/+log/b522808eb0af..20108acef7d2

2023-07-27 mike@reedtribe.org Unfriend main scalercontext subclasses
2023-07-27 nscobie@google.com Fix CtsEnforcement for U tests marked as T
2023-07-27 kjlubick@google.com Remove legacy SkImage and SkSurface methods

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,jonahwilliams@google.com,michaelludwig@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

engine/src/flutter/ci/licenses_golden/licenses_skia

@@ -1,4 +1,4 @@
-Signature: 0a0671991f1dcf9bc0359a8b80b778f7
+Signature: e50c9c321f6675fbb3863728323e0893
 
 ====================================================================================================
 LIBRARY: etc1