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Add Ruby 4.0 / Puppet 9 support #480

Job	Run time
spec (windows-latest ruby 4.0 \| puppet ~> 9.0) / spec	3m 10s
spec (windows-latest ruby 3.2 \| puppet ~> 8.0) / spec	3m 24s
spec (ubuntu-latest ruby 4.0 \| puppet ~> 9.0) / spec	1m 2s
spec (ubuntu-latest ruby 3.2 \| puppet ~> 8.0) / spec	43s
acceptance (3.2, ubuntu-latest) / acceptance	32s
acceptance (4.0, ubuntu-latest) / acceptance	19s
acceptance (4.0, windows-latest) / acceptance	1m 2s
acceptance (3.2, windows-latest) / acceptance	2m 25s
	12m 37s