Ruby

Support RBS::AST::Members::ClassVariable #1140

Job	Run time
ruby-versions / Generate Ruby versions	11s
build (3.2)	44s
build (3.3)	45s
build (3.4)	42s
build (truffleruby-head)	32s
build (head)	49s
build (truffleruby)	33s
	4m 16s

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