docs: release notes for the v21.2.14 release #3684

Job	Run time
list	35s
workflow (build-unit-tests)	2m 22s
workflow (devkit-core-tests)	1m 52s
workflow (build-cli)	2m 0s
workflow (devkit-core-tests-rerun)	1m 36s
workflow (modules-builder-tests)	1m 54s
	10m 19s

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