[neon/backports-focal/libavif/Neon/release] /: Update upstream source from tag 'upstream/0.9.3'

[Boyuan Yang]

Git commit 32113c782e4aaf998fbe26b72373114f962c3223 by Boyuan Yang.
Committed on 24/10/2021 at 23:59.
Pushed by jriddell into branch 'Neon/release'.

Update upstream source from tag 'upstream/0.9.3'

Update to upstream version '0.9.3'
with Debian dir b484fc36e891abb918dab1555a3d3fad93940e64


https://invent.kde.org/neon/backports-focal/libavif/commit/32113c782e4aaf998fbe26b72373114f962c3223