docs: release notes for the v21.0.2 release #2626

Job	Run time
list	28s
workflow (build-cli)	1m 42s
workflow (build-unit-tests)	2m 30s
workflow (devkit-core-tests)	1m 20s
workflow (devkit-core-tests-rerun)	1m 19s
workflow (modules-builder-tests)	2m 1s
	9m 20s

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