Bump ffmpeg-source from 44a0148 to 5f87a68

Bumps [ffmpeg-source](https://github.com/FFmpeg/FFmpeg) from `44a0148` to `5f87a68`.
- [Commits](FFmpeg/FFmpeg@44a0148...5f87a68)

---
updated-dependencies:
- dependency-name: ffmpeg-source
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>