docs: release notes for the v20.1.6 release #8359

Job	Run time
build	1m 54s
lint	1m 53s
e2e_windows (windows-2025, 22, npm, 0)	37s
e2e_windows (windows-2025, 22, npm, 1)	45s
e2e_windows (windows-2025, 22, esbuild, 2)	36s
e2e_windows (windows-2025, 22, esbuild, 0)	1m 8s
e2e_windows (windows-2025, 22, npm, 4)	38s
e2e_windows (windows-2025, 22, esbuild, 1)	52s
e2e_windows (windows-2025, 22, esbuild, 4)	37s
e2e_windows (windows-2025, 22, esbuild, 3)	38s
e2e_windows (windows-2025, 22, esbuild, 5)	36s
e2e_windows (windows-2025, 22, npm, 5)	37s
e2e_windows (windows-2025, 22, npm, 3)	31s
e2e_windows (windows-2025, 22, npm, 2)	37s
test	1s
Browser Compatibility Tests	1s
e2e-snapshots	1s
publish-snapshots	1s
e2e-package-managers	1s
e2e	1s
	12m 5s

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