use `Kernel.callee` #451

Job	Run time
ruby-versions / Generate Ruby versions	4s
test (3.0)	42s
test (3.3)	46s
test (3.1)	46s
test (debug)	1m 8s
test (3.4)	45s
test (head)	47s
test (3.2)	48s
	5m 46s

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