ffmpeg: adjust update and pinning advice

It is best to keep as many FFmpeg dependencies unpinned as possible,
so that only the packages that actually break are kept behind on old
versions. I ran into many cases recently where a package was pinned
to an old version of FFmpeg but worked fine with the latest one,
making the older versions look more necessary than they actually were.

This will make it easier to find packages that need intervention to
be updated to newer versions and speed up the process of jettisoning
old FFmpeg versions. The cost of potentially holding back the default
version for a little while to let major parts of the ecosystem catch
up is minor by comparison, especially since it has happened with 7
anyway due to Darwin problems.

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