docs: release notes for the v20.3.20 release #3241

Job	Run time
list	25s
workflow (devkit-core-tests-rerun)	1m 43s
workflow (modules-builder-tests)	2m 6s
workflow (build-unit-tests)	2m 38s
workflow (devkit-core-tests)	1m 39s
workflow (build-cli)	1m 46s
	10m 17s

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