docs: release notes for the v20.3.20 release #10020

Job	Run time
build	2m 17s
build-e2e-windows	2m 30s
lint	2m 3s
publish-snapshots	2m 26s
test	2m 23s
Browser Compatibility Tests	2m 25s
e2e-windows (24, esbuild, 3)	2m 11s
e2e-windows (24, esbuild, 4)	2m 13s
e2e-windows (24, esbuild, 0)	2m 9s
e2e-windows (24, webpack, 0)	2m 10s
e2e-windows (24, esbuild, 5)	2m 10s
e2e-windows (24, webpack, 3)	2m 11s
e2e-windows (24, webpack, 4)	2m 11s
e2e-windows (24, esbuild, 2)	2m 10s
e2e-windows (24, esbuild, 1)	2m 2s
e2e-windows (24, webpack, 5)	2m 11s
e2e-windows (24, webpack, 1)	2m 11s
e2e-windows (24, webpack, 2)	2m 4s
e2e	1s
e2e-snapshots	1s
e2e-package-managers	1s
	40m 0s

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