Remove unnecessary RuboCop RSpec settings #272

Job	Run time
Confirm config and documentation	10s
Test coverage	12s
Edge RuboCop: internal_investigation	12s
Edge RuboCop: spec	16s
Ruby 2.7: internal_investigation	25s
Prism	45s
RSpec 4	16s
Ruby 2.7: spec	29s
Ruby 3.0: internal_investigation	9s
Ruby 3.0: spec	11s
Ruby 3.1: internal_investigation	11s
Ruby 3.1: spec	13s
Ruby 3.2: internal_investigation	11s
Ruby 3.2: spec	11s
Ruby 3.3: internal_investigation	15s
Ruby 3.3: spec	11s
Ruby ruby-head: internal_investigation	12s
Ruby ruby-head: spec	13s
Ruby jruby-9.4: internal_investigation	1m 1s
Ruby jruby-9.4: spec	1m 2s
	6m 45s

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