Ruby

Fix typo in README.md #1129

Job	Run time
ruby-versions / Generate Ruby versions	5s
build (3.3)	43s
build (3.4)	41s
build (head)	41s
build (3.2)	42s
build (truffleruby-head)	32s
build (truffleruby)	33s
	3m 57s

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