Fix false negatives for `Performance/StringIdentifierArgument` #41

Job	Run time
JRuby 9.4	2m 4s
Check the oldest supported RuboCop version	44s
Ruby 2.7	36s
Ruby 3.0	32s
Check documentation syntax	12s
Ruby 3.1	35s
Ruby 3.2	27s
Ruby head	25s
	5m 35s

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