Ruby

Remove workaround for old Prism #1100

Job	Run time
ruby-versions / Generate Ruby versions	2s
build (3.2)	39s
build (3.3)	43s
build (3.4)	41s
build (head)	40s
build (truffleruby)	30s
build (truffleruby-head)	36s
	3m 51s

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