Ruby

Clear `$stdin` before showing prompt #3266

Job	Run time
ruby-versions / Generate Ruby versions	2s
ruby-versions / Generate Ruby versions	2s
ruby-versions / Generate Ruby versions	2s
test (2.7)	30m 16s
test (2.7)	30m 16s
test (2.7)	30m 16s
test (3.0)	30m 15s
test (3.0)	30m 16s
test (3.0)	30m 15s
test (3.1)	30m 16s
test (3.1)	30m 15s
test (3.1)	30m 16s
test (3.2)	30m 16s
test (3.2)	30m 17s
test (3.2)	30m 16s
test (3.3)	30m 15s
test (3.3)	30m 16s
test (3.3)	30m 16s
test (3.4)	30m 15s
test (3.4)	30m 17s
test (3.4)	30m 16s
test (debug)	30m 16s
test (debug)	30m 16s
test (debug)	30m 16s
test (head)	30m 16s
test (head)	30m 16s
test (head)	30m 15s
	12h 6m 26s

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