enable `experimental:strictDefs` (#24225) #257

Job	Run time
ubuntu-20.04 (batch: allowed_failures)	5m 0s
ubuntu-20.04 (batch: 0_3)	28m 3s
ubuntu-20.04 (batch: 1_3)	22m 21s
ubuntu-20.04 (batch: 2_3)	29m 24s
macos-13 (batch: allowed_failures)	8m 33s
macos-13 (batch: 0_3)	34m 25s
macos-13 (batch: 1_3)	31m 57s
macos-13 (batch: 2_3)	34m 57s
	3h 14m 40s

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