skip "\n" from `$stdin` before showing prompt #439

Job	Run time
ruby-versions / Generate Ruby versions	3s
test (3.3)	40s
test (3.0)	54s
test (3.4)	36s
test (head)	34s
test (3.2)	56s
test (debug)	55s
test (3.1)	53s
ruby-versions / Generate Ruby versions	3s
test (debug)	55s
test (3.3)	40s
test (3.0)	42s
test (3.1)	54s
test (3.2)	52s
test (3.4)	36s
test (head)	34s
ruby-versions / Generate Ruby versions	3s
test (3.0)	42s
test (3.4)	36s
test (3.3)	40s
test (3.1)	52s
test (3.2)	54s
test (debug)	55s
test (head)	34s
ruby-versions / Generate Ruby versions	2s
test (3.1)	53s
test (3.0)	54s
test (3.2)	58s
test (3.4)	40s
test (3.3)	39s
test (head)	36s
test (debug)	55s
	21m 40s

Provide feedback