community/libdovi: upgrade to 3.2.0 and take over maintainership
Changelog:
## 3.2.0
- Deprecated `RpuDataHeader.rpu_nal_prefix`.
- Added `av1` module for handling AV1 Dolby Vision ITU-T T.35 metadata OBU payloads.
- AV1 RPU bytes can now be encoded with `write_av1_rpu_metadata_obu_t35_payload`.
- The payload is meant to be used for `itu_t_t35_payload_bytes`.