docs: release notes for the v20.3.12 release #2563

Job	Run time
list	24s
workflow (build-cli)	1m 43s
workflow (devkit-core-tests)	1m 26s
workflow (modules-builder-tests)	1m 43s
workflow (devkit-core-tests-rerun)	1m 18s
workflow (build-unit-tests)	2m 34s
	9m 8s

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