Add Debian 11 support #219

Job	Run time
Puppet / Static validations	19s
Puppet / 8 (Ruby 3.2)	44s
Puppet / 7 (Ruby 2.7)	58s
Puppet / Puppet 8 - CentOS 7	1m 14s
Puppet / Puppet 7 - CentOS 7	1m 8s
Puppet / Puppet 8 - Debian 10	1m 25s
Puppet / Puppet 7 - Debian 10	1m 48s
Puppet / Puppet 8 - Debian 11	1m 21s
Puppet / Puppet 7 - Debian 11	1m 9s
Puppet / Puppet 8 - Ubuntu 18.04	1m 36s
Puppet / Puppet 7 - Ubuntu 18.04	1m 23s
Puppet / Puppet 8 - Ubuntu 20.04	1m 49s
Puppet / Puppet 7 - Ubuntu 20.04	1m 29s
Puppet / Distro Puppet - Archlinux rolling	58s
Puppet / Test suite	0s
	17m 21s

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