release: cut the v21.0.0-next.1 release #1878

Job	Run time
build	31s
build-e2e-windows	28s
lint	2m 18s
e2e-windows	-1s
test	0s
publish-snapshots	0s
Browser Compatibility Tests	0s
e2e	0s
e2e-snapshots	-1s
e2e-package-managers	-1s
	3m 14s

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