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Whoops, didn't get all affected tox factors. Will push again shortly.

FYI @Cadair, this is the kind of thing that gets much easier to handle smoothly when uv is used in all tox environments :)

If matplotlib is fixing this fast enough, maybe we can just wait it out.

This patch has 0 impact on users, so I'd still prefer to go with it now. It could be days/weeks before matplotlib cuts a new release