Update Gemfile to reflect a modern Puppet #161

Job	Run time
Static code analysis (7.22.0, 2.7.7)	1m 33s
Integration tests (puppet7, ubuntu-18.04)	3m 6s
Static code analysis (7.22.0, 3.0.5)	1m 14s
Static code analysis (7.22.0, 3.1.3)	1m 24s
Integration tests (puppet7, ubuntu-20.04)	3m 10s
Integration tests (puppet7, ubuntu-22.04)	2m 44s
Integration tests (puppet7, centos-7)	4m 25s
Integration tests (puppet7, centos-9)	4m 27s
Integration tests (puppet7, debian-10)	3m 2s
Integration tests (puppet7, debian-11)	2m 36s
Integration tests (puppet8, ubuntu-18.04)	3m 34s
Integration tests (puppet8, ubuntu-20.04)	2m 59s
Integration tests (puppet8, ubuntu-22.04)	3m 7s
Integration tests (puppet8, centos-7)	4m 37s
Integration tests (puppet8, centos-9)	4m 42s
Integration tests (puppet8, debian-10)	3m 6s
Integration tests (puppet8, debian-11)	2m 39s
	52m 25s

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