[Fix #1423] Fix an error for `Rails/StrongParametersExpect` #521

Job	Run time
Check documentation syntax	12s
Spec - JRuby	2m 14s
Spec - 2.7	31s
Check the oldest supported RuboCop version	36s
Spec - 3.0	37s
Prism	34s
Spec - 3.1	41s
Spec - 3.2	18s
Spec - 3.3	18s
Spec - 3.4	14s
Spec - head	17s
	6m 32s

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