Upgrade dependencies golang 1.7, argo and k8s api's 1.21 #93

[ccfishk]

Is this a BUG REPORT or FEATURE REQUEST?:
FEATURE
What happened:
upgrade dependencies:

Upgrade to Go 1.7+
Upgrade Kubernetes APIs (apimachinery, api, etc.) to 1.21
Upgrade Argo to v3.2.6
What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

Other debugging information (if applicable):

• RollingUpgrade status:

$ kubectl describe rollingupgrade <rollingupgrade-name>

• controller logs:

$ kubectl logs <rolling-upgrade-controller pod>