use `Kernel.callee` #455

Job	Run time
ruby-versions / Generate Ruby versions	5s
test (3.4)	41s
test (debug)	1m 6s
test (3.1)	41s
test (3.0)	44s
test (head)	40s
test (3.3)	50s
test (3.2)	47s
	5m 34s

Provide feedback