Ruby

Self-document the XDG_STATE_HOME fallback #3288

Job	Run time
ruby-versions / Generate Ruby versions	5s
test (2.7)	5m 48s
test (3.1)	19m 0s
test (3.3)	5m 56s
test (3.0)	18m 54s
test (3.2)	5m 41s
test (head)	5m 10s
test (3.4)	5m 22s
test (debug)	13m 50s
	1h 19m 46s

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