release: cut the v21.2.10 release #1965

Job	Run time
list	22s
workflow (build-unit-tests)	34s
workflow (devkit-core-tests-rerun)	24s
workflow (devkit-core-tests)	38s
workflow (modules-builder-tests)	37s
workflow (build-cli)	30s
	3m 5s

Provide feedback