Roll Skia from b1a31575c373 to 480540178356 (1 revision) (#191723)

https://skia.googlesource.com/skia.git/+log/b1a31575c373..480540178356

2026-08-25 skia-autoroll@skia-public.iam.gserviceaccount.com Manual roll
Dawn from 84eeb817a85e to c169e62117d8 (5 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 fmalita@google.com,jsimmons@google.com,kjlubick@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