Pump to 2.1.0-beta.0 pre-release #489

Job	Run time
build-and-test / build (20.X, arm64, lyrical)	9m 11s
build-and-test / build (20.X, arm64, kilted)	9m 46s
build-and-test / build (20.X, arm64, humble)	8m 15s
build-and-test / build (20.X, arm64, jazzy)	8m 3s
	35m 15s

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