Ruby

Support RBS::AST::Members::ClassVariable #1138

Job	Run time
ruby-versions / Generate Ruby versions	3s
build (3.3)	43s
build (head)	43s
build (3.2)	43s
build (truffleruby-head)	32s
build (3.4)	42s
build (truffleruby)	30s
	3m 56s

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