Enable `InternalAffairs/UndefinedConfig` #113

Job	Run time
JRuby 9.4	2m 28s
Check documentation syntax	13s
Ruby 2.7	39s
Ruby 3.0	39s
Check the oldest supported RuboCop version	41s
Prism	38s
Ruby 3.1	40s
Ruby 3.2	27s
Ruby 3.3	28s
Ruby head	40s
	7m 33s

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