release: cut the v21.0.6 release #2861

Job	Run time
list	26s
workflow (build-cli)	1m 53s
workflow (build-unit-tests)	2m 43s
workflow (modules-builder-tests)	1m 54s
workflow (devkit-core-tests)	1m 25s
workflow (devkit-core-tests-rerun)	1m 27s
	9m 48s

Provide feedback