Bug 1758482 - Update dav1d to new version 28a9c46e1c36540d3276299f2e284ece1d2386be from 2022-02-04T23:02:17.000-03:00. r=media-playback-reviewers,padenot

Normally updatebot would create a revision, allowing me to review it single-handedly, but https://phabricator.services.mozilla.com/D140519 was a failure because of changes updatebot didn't know how to handle, so I just need **someone** to approve the update to get this landed. This has a bit of priority since it's blocking https://bugzilla.mozilla.org/show_bug.cgi?id=1757971, which we want to get uplifted for Fx99.

Differential Revision: https://phabricator.services.mozilla.com/D140921