Ruby

Remove ad-hoc "untyped" guard from wrong_return_type #1312

Job	Run time
ruby-versions / Generate Ruby versions	3s
build (3.4)	55s
build (truffleruby-head)	40s
build (3.3)	52s
build (head)	43s
build (4.0)	40s
build (truffleruby)	34s
	4m 27s

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