Needs approval from an approver in each of these files:
- ~~[OWNERS](https://github.com/kubeflow/arena/blob/master/OWNERS)~~ [Syulin7,cheyang]
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What this PR does / why we need it: Upgrade Go version to v1.20.
Which issue(s) this PR fixes (optional, in
Fixes #<issue number>, #<issue number>, ...
format, will close the issue(s) when PR gets merged): Fixes #