Ruby

Use nested hashes for edge storage in ChangeSet #1348

Job	Run time
ruby-versions / Generate Ruby versions	6s
build (4.0)	45s
build (truffleruby-head)	40s
build (3.3)	1m 14s
build (truffleruby)	42s
build (3.4)	55s
build (head)	42s
	5m 4s

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