ffmpeg: fix CVE-2024-7055

ffmpeg: fix CVE-2024-7055

A vulnerability was found in FFmpeg up to 7.0.1. It has been classified as critical.
This affects the function pnm_decode_frame in the library /libavcodec/pnmdec.c.
The manipulation leads to heap-based buffer overflow. It is possible to initiate
the attack remotely. The exploit has been disclosed to the public and may be used.
Upgrading to version 7.0.2 is able to address this issue. It is recommended to
upgrade the affected component. The associated identifier of this vulnerability is VDB-273651.

Signed-off-by: Archana Polampalli <archana.polampalli@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>