ffmpeg: upgrade 6.1.2 -> 6.1.3

ffmpeg: upgrade 6.1.2 -> 6.1.3

Fixes:
CVE-2023-6604
CVE-2023-6602
CVE-2025-7700

Changelog:
https://github.com/FFmpeg/FFmpeg/blob/n6.1.3/Changelog

Removed the CVE patches which are already fixed with this upgrade

ref:
https://github.com/FFmpeg/FFmpeg/commit/c104119c6b5e00496c5ff14071c85f95c98b7ae5
https://github.com/FFmpeg/FFmpeg/commit/7d79d0a43b5533ff584249332bc1db7fedbab1d2
https://github.com/FFmpeg/FFmpeg/commit/a4b6e37ad5f50454974fa22cc8f19d83cdaff0eb
https://github.com/FFmpeg/FFmpeg/commit/efedc1d1b6aef2481cf613a11992b1dce6320055
https://github.com/FFmpeg/FFmpeg/commit/dcf34f13f516aa0e214384f3185aff306feba01d
https://github.com/FFmpeg/FFmpeg/commit/bed04417b4d38af7a1b477b24ea6e26547e32373
https://github.com/FFmpeg/FFmpeg/commit/b43a12363c1fef0efa7eac15b6b830417656db15
https://github.com/FFmpeg/FFmpeg/commit/e2b20632b8c71a4e174511f8ff6e8342e0c63bd3
https://github.com/FFmpeg/FFmpeg/commit/43f64690ad9df72976bcbd6ea9e41b2542db2464

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