docs: release notes for the v20.3.19 release #1749

Job	Run time
list	21s
workflow (modules-builder-tests)	34s
workflow (build-unit-tests)	29s
workflow (devkit-core-tests)	34s
workflow (devkit-core-tests-rerun)	31s
workflow (build-cli)	28s
	2m 57s

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