Add CentOS 9 support #220

Job	Run time
Puppet / Static validations	16s
Puppet / 8 (Ruby 3.2)	45s
Puppet / Puppet 8 - CentOS 7	1m 16s
Puppet / 7 (Ruby 2.7)	1m 4s
Puppet / Puppet 7 - CentOS 7	1m 8s
Puppet / Puppet 8 - CentOS 9	1m 28s
Puppet / Puppet 7 - CentOS 9	1m 2s
Puppet / Puppet 8 - Debian 10	1m 19s
Puppet / Puppet 7 - Debian 10	1m 14s
Puppet / Puppet 8 - Ubuntu 18.04	1m 34s
Puppet / Puppet 7 - Ubuntu 18.04	1m 23s
Puppet / Puppet 8 - Ubuntu 20.04	1m 26s
Puppet / Puppet 7 - Ubuntu 20.04	1m 27s
Puppet / Distro Puppet - Archlinux rolling	1m 11s
Puppet / Test suite	0s
	16m 33s

Provide feedback