release: cut the v21.2.4 release #3309

Job	Run time
list	20s
workflow (modules-builder-tests)	1m 44s
workflow (devkit-core-tests-rerun)	1m 28s
workflow (build-unit-tests)	2m 17s
workflow (devkit-core-tests)	1m 22s
workflow (build-cli)	1m 44s
	8m 55s

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