[RESULT][VOTE] Release Apache Calcite Avatica 1.21.0 (release candidate 0)

[Francis Chuang]

Thanks to everyone who have tested the release candidate and given their 
comments and votes.

The tally is as follows.
3 binding +1s:
Francis Chuang
Julian Hyde
Stamatis Zampetakis

3 non-binding +1s:
Chunwei Lei
Benchao Li
Xiong Duan

Therefore, I am delighted to announce that the proposal to release 
Apache Calcite Avatica 1.21.0 has passed.

Thanks everyone. We’ll now roll the release out to the mirrors.

Francis