MediaGoblin 0.12.1 released

[Ben Sturmfels]

We're pleased to announce the release of MediaGoblin 0.12.1. See the release
notes (https://docs.mediagoblin.org/en/stable/siteadmin/relnotes.html) for full
details and upgrading instructions.

This patch release fixes a number of Python dependency issues, allows us
to support newer autoconf versions, fixes a few small bugs and improves
the documentation. Support for Debian Bookwork, Ubuntu 22.04 and Fedora
36 is notably missing from this release, but will be addressed in the
upcoming version 0.13.0.

Thanks go to Olivier Mehani, Elisei Roca, Jgart, Dan Helfman and Peter Horvath
for their contributions in this release. Since our last release, long-time
MediaGoblin user and contributor Olivier has joined me as co-maintainer on the
project. Thanks for all your help Olivier!

Regards,
Ben