Switch to voxpupuli-rubocop #281

Job	Run time
spec (ubuntu-latest ruby 2.7 \| puppet ~> 7.0) / spec	30s
spec (windows-latest ruby 2.7 \| puppet ~> 7.0) / spec	2m 34s
spec (ubuntu-latest ruby 3.2 \| puppet ~> 8.0) / spec	17s
spec (windows-latest ruby 3.2 \| puppet ~> 8.0) / spec	1m 7s
	4m 28s

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