puppet/systemd: allow 8.x #321

Job	Run time
Puppet / Static validations	32s
Puppet / 8 (Ruby 3.2)	49s
Puppet / Distro Puppet - Archlinux rolling	1m 27s
Puppet / 7 (Ruby 2.7)	1m 21s
Puppet / Puppet 8 - Ubuntu 20.04	2m 39s
Puppet / Puppet 7 - Ubuntu 20.04	2m 50s
Puppet / Puppet 8 - Ubuntu 22.04	2m 9s
Puppet / Puppet 7 - Ubuntu 22.04	2m 8s
Puppet / Puppet 8 - Debian 11	1m 49s
Puppet / Puppet 7 - Debian 11	1m 55s
Puppet / Puppet 8 - Debian 12	1m 58s
Puppet / Puppet 7 - Debian 12	2m 9s
Puppet / Test suite	2s
	21m 48s

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