Release team membership changes

[Vincent Untz <vuntz gnome org>]

Hi,

A few weeks ago, John Palmieri decided to leave the release team to get
more time to focus on his other duties. We thank him for the work he has
done within the team in the past.

The well-known Matthias Clasen joins the team and we're all sure he'll
be doing an amazing job as a release team member. Welcome Matthias!

Cheers,

Vincent

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