build(deps): bump third-party/FFmpeg/FFmpeg from 71007e6 to b660192 (#534)

Bumps [third-party/FFmpeg/FFmpeg](https://github.com/FFmpeg/FFmpeg) from `71007e6` to `b660192`.
- [Commits](FFmpeg/FFmpeg@71007e6...b660192)

---
updated-dependencies:
- dependency-name: third-party/FFmpeg/FFmpeg
  dependency-version: b660192fb81338bd260c10b40753cb3c6f0cebbc
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]