release: cut the v21.2.8 release #3453

Job	Run time
list	20s
workflow (modules-builder-tests)	1m 49s
workflow (build-cli)	1m 31s
workflow (build-unit-tests)	2m 18s
workflow (devkit-core-tests-rerun)	1m 29s
workflow (devkit-core-tests)	1m 27s
	8m 54s

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