This update for ffmpeg-4 fixes the following issues:

- Dropped support for libmfx to fix the following CVEs:
  * libmfx: improper input validation (CVE-2023-48368, bsc#1226897)
  * libmfx: improper buffer restrictions (CVE-2023-45221, bsc#1226898)
  * libmfx: out-of-bounds read (CVE-2023-22656, bsc#1226899)
  * libmfx: out-of-bounds write (CVE-2023-47282, bsc#1226900)
  * libmfx: improper buffer restrictions (CVE-2023-47169, bsc#1226901)
- CVE-2024-7055: heap-based buffer overflow in pnmdec.c from the libavcodec library. (bsc#1229026)