Bump kotlin from 2.3.10 to 2.3.21 (#435) #324

Job	Run time
build-and-test / check-style	4m 8s
build-and-test / check-windows / check	13m 30s
build-and-test / check-macos / check	10m 46s
build-and-test / check-linux / check	11m 0s
publish	21m 31s
	1h 0m 55s

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