Update rav1e to 0.3.4
- Fix desync in some 4K clips.
- Fix desync with regard to inter-split bottom-up search.
Depends on D9615.
Test Plan: Transcoded VP9 video to AV1 using FFmpeg with librav1e, tested resulting video in mpv.
Reviewers: Triage Team, JoshStrobl
Reviewed By: Triage Team, JoshStrobl
Differential Revision: https://dev.getsol.us/D9616