Update Gemfile to reflect a modern Puppet #145

Job	Run time
Static code analysis (7.22.0, 2.7.7)	1m 24s
Integration tests (puppet7, ubuntu-18.04)	3m 50s
Static code analysis (7.22.0, 3.0.5)	1m 29s
Integration tests (puppet7, ubuntu-20.04)	3m 55s
Static code analysis (7.22.0, 3.1.3)	1m 13s
Integration tests (puppet7, ubuntu-22.04)	3m 24s
Integration tests (puppet7, centos-7)	4m 42s
Integration tests (puppet7, centos-8)	44s
Integration tests (puppet7, centos-9 debian-10)	39s
Integration tests (puppet7, debian-11)	2m 45s
Integration tests (puppet8, ubuntu-18.04)	3m 6s
Integration tests (puppet8, ubuntu-20.04)	3m 27s
Integration tests (puppet8, ubuntu-22.04)	2m 58s
Integration tests (puppet8, centos-7)	4m 48s
Integration tests (puppet8, centos-8)	40s
Integration tests (puppet8, centos-9 debian-10)	39s
Integration tests (puppet8, debian-11)	3m 13s
	42m 56s

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