[FFmpeg-cvslog] changelog: update for 7.0

ffmpeg | branch: release/7.0 | Jean-Baptiste Kempf | Wed Apr 3 23:12:54 2024 +0200| [3b6732bcb30783daaf5998207bf79061f4733ff5] | committer: James Almer changelog: update for 7.0 Signed-off-by: James Almer (cherry picked from commit 486a2b964ba4e496ecd821e189d495ad06585abe) > http://git.vide

[FFmpeg-cvslog] changelog: update for 7.0

ffmpeg | branch: master | Jean-Baptiste Kempf | Wed Apr 3 23:12:54 2024 +0200| [486a2b964ba4e496ecd821e189d495ad06585abe] | committer: James Almer changelog: update for 7.0 Signed-off-by: James Almer > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=486a2b964ba4e496ecd821e189d495a