use `Kernel.callee` #1781

Job	Run time
ruby-versions / Generate Ruby versions	6s
test (3.0)	1m 54s
test (3.1)	1m 55s
test (3.2)	1m 50s
test (3.3)	1m 52s
test (3.4)	1m 48s
test (debug)	6m 8s
test (head)	1m 43s
test (2.7)	2m 8s
ruby-versions / Generate Ruby versions	6s
test (head)	1m 49s
test (2.7)	2m 10s
test (debug)	5m 38s
test (3.3)	1m 52s
test (3.2)	1m 50s
test (3.0)	2m 0s
test (3.4)	1m 48s
test (3.1)	1m 55s
	38m 32s

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