CI

Drop Ubuntu 18.04 #298

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Run time

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Job	Run time
Puppet / Static validations	19s
Puppet / 8 (Ruby 3.2)	29s
Puppet / Puppet 8 - Ubuntu 20.04	2m 25s
Puppet / 7 (Ruby 2.7)	45s
Puppet / Puppet 7 - Ubuntu 20.04	2m 22s
Puppet / Puppet 8 - Ubuntu 22.04	2m 9s
Puppet / Puppet 7 - Ubuntu 22.04	2m 26s
Puppet / Puppet 8 - Debian 11	2m 32s
Puppet / Puppet 7 - Debian 11	2m 29s
Puppet / Puppet 8 - Debian 12	2m 7s
Puppet / Puppet 7 - Debian 12	1m 52s
Puppet / Test suite	1s
	19m 56s