Add Puppet 8 compatibility #22

Job	Run time
Puppet / Static validations	15s
Puppet / 8 (Ruby 3.2)	42s
Puppet / 7 (Ruby 2.7)	46s
Puppet / Puppet 8 - Ubuntu 20.04	1m 46s
Puppet / Puppet 7 - Ubuntu 20.04	3m 9s
Puppet / Puppet 8 - Ubuntu 22.04	2m 10s
Puppet / Puppet 7 - Ubuntu 22.04	1m 57s
Puppet / Puppet 8 - Debian 10	1m 33s
Puppet / Puppet 7 - Debian 10	1m 30s
Puppet / Puppet 8 - Debian 11	1m 31s
Puppet / Puppet 7 - Debian 11	1m 33s
Puppet / Distro Puppet - Archlinux rolling	44s
Puppet / Test suite	0s
	17m 36s

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