Update rubocop-rspec requirement from = 2.19.0 to 2.28.0 #706

Job	Run time	Billable time
spec (ruby 3.2 \| puppet ~> 8.0) / spec	20s	0s
spec (ruby 2.7 \| puppet ~> 7.0) / spec	40s	0s
acceptance (${{ matrix.runs_on }} ruby ${{ matrix.ruby_version }} \| puppet ${{ matrix.puppet_version }})	0s	0s
	1m 0s	0s

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