Move testing to more recent dependencies

Ubuntu Xenial is now EOL. We can update dependencies to those that are in both:

Ubuntu 18.04 LTS (Bionic Beaver)
Debian GNU/Linux 10 (Buster)
and Fedora stable, but it will always be more recent than Ubuntu/Debian, so let's not consider it.

Red-hat is always too old and users should use spack on it.

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