Add support for modern keyrings #173

Job	Run time
Spec / Setup Test Matrix	38s
Spec / Spec tests (Puppet: ~> 7.24, Ruby Ver: 2.7)	1m 7s
Spec / Spec tests (Puppet: ~> 8.0, Ruby Ver: 3.2)	49s
Acceptance / Setup Test Matrix	3m 11s
Acceptance / Acceptance tests (Debian-10, puppet7-nightly)	8m 28s
Acceptance / Acceptance tests (Debian-10, puppet8-nightly)	9m 39s
Acceptance / Acceptance tests (Debian-11, puppet7-nightly)	6m 49s
Acceptance / Acceptance tests (Debian-11, puppet8-nightly)	9m 20s
Acceptance / Acceptance tests (Ubuntu-18.04, puppet7-nightly)	11m 57s
Acceptance / Acceptance tests (Ubuntu-18.04, puppet8-nightly)	14m 2s
Acceptance / Acceptance tests (Ubuntu-20.04, puppet7-nightly)	8m 22s
Acceptance / Acceptance tests (Ubuntu-20.04, puppet8-nightly)	10m 29s
Acceptance / Acceptance tests (Ubuntu-22.04, puppet7-nightly)	9m 49s
Acceptance / Acceptance tests (Ubuntu-22.04, puppet8-nightly)	10m 30s
	1h 45m 10s

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