docs: release notes for the v20.0.3 release #1323

Job	Run time
list	25s
workflow (modules-builder-tests)	1m 39s
workflow (devkit-core-tests-rerun)	1m 27s
workflow (build-cli)	1m 30s
workflow (devkit-core-tests)	1m 16s
workflow (build-unit-tests)	2m 11s
	8m 28s

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