release: cut the v21.0.0-next.4 release #1914

Job	Run time
list	27s
workflow (build-cli)	1m 41s
workflow (devkit-core-tests-rerun)	1m 30s
workflow (devkit-core-tests)	1m 23s
workflow (modules-builder-tests)	1m 53s
workflow (build-unit-tests)	2m 22s
	9m 16s

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