release: cut the v21.0.0-rc.5 release #2465

Job	Run time
list	26s
workflow (modules-builder-tests)	1m 57s
workflow (build-cli)	1m 43s
workflow (devkit-core-tests)	1m 25s
workflow (devkit-core-tests-rerun)	1m 28s
workflow (build-unit-tests)	2m 23s
	9m 22s

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