multimedia/ffnvcodec-headers: update to 12.0.16.1
Changes: https://github.com/FFmpeg/nv-codec-headers/compare/n12.0.16.0...n12.0.16.1
PR: 274432
Approved by: Alex S (maintainer)
(cherry picked from commit a6340e480b5a046206f027494e028a7c73d79ed5)