[BEAM-9463] Bump ZetaSQL to 2020.03.1
[BEAM-9463] Bump ZetaSQL to 2020.03.1

robertwb/incubator-beam,apache/beam,lukecwik/incubator-beam,apache/beam,chamikaramj/beam,robertwb/incubator-beam,chamikaramj/beam,chamikaramj/beam,robertwb/incubator-beam,robertwb/incubator-beam,chamikaramj/beam,lukecwik/incubator-beam,lukecwik/incubator-beam,robertwb/incubator-beam,apache/beam,robertwb/incubator-beam,apache/beam,iemejia/incubator-beam,apache/beam,lukecwik/incubator-beam,iemejia/incubator-beam,apache/beam,lukecwik/incubator-beam,lukecwik/incubator-beam,chamikaramj/beam,chamikaramj/beam,apache/beam,chamikaramj/beam,chamikaramj/beam,apache/beam,chamikaramj/beam,apache/beam,chamikaramj/beam,apache/beam,lukecwik/incubator-beam,lukecwik/incubator-beam,robertwb/incubator-beam,apache/beam,robertwb/incubator-beam,lukecwik/incubator-beam,robertwb/incubator-beam,lukecwik/incubator-beam,robertwb/incubator-beam