(maint) Update ruby_rubocop_validator_spec.rb minor typo #687

Job	Run time
spec (ruby 3.2) / spec	38s
spec (ruby 2.7) / spec	49s
acceptance (ruby 3.2 \| ubuntu-latest) / acceptance	13m 30s
acceptance (ruby 2.7 \| ubuntu-latest) / acceptance	13m 29s
acceptance (ruby 2.7 \| windows-2019) / acceptance	32m 2s
acceptance (ruby 3.2 \| windows-2019) / acceptance	7m 49s
	1h 8m 17s

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