[Release Vote] Vote for Release V0.4.0-rc2

[zhoujinsong]

Hi Everyone,

I propose that we release the following RC as the official Arctic 0.4.0 release.

The commit ID is c9bb23c

This corresponds to the tag: v0.4.0-rc2
https://github.com/NetEase/arctic/commits/v0.4.0-rc2
https://github.com/NetEase/arctic/tree/v0.4.0-rc2
Please check out, build, and test.

[ ] +1 Release this as Arctic 0.4.0
[ ] +0
[ ] -1 Do not release this because...

Please vote in the next 72 hours and add your test steps when voting.