.papr.yml: Update to Fedora 30
.papr.yml: Update to Fedora 30

We need at least GLib 2.60.1 for this PR:
https://github.com/flatpak/flatpak/pull/2797

Don't update the host distro for the docker run, since F30 Atomic
doesn't exist yet. That's fine though, since the F30 container is
available.

Closes: #3088
Approved by: alexlarsson

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