Don't import k8s.io/kubernetes

[wanghong230]

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Checklist:

• I've searched in the docs and FAQ for my answer: https://bit.ly/argocd-faq.
• I've included steps to reproduce the bug.
• I've pasted the output of argocd version.

Describe the bug

The import of k8s.io/kubernetes at

argo-cd/go.mod

Line 80 in cd302fd

k8s.io/kubernetes v1.19.2

See reason at kubernetes/kubernetes#90358
The import causes the other project to import the argo-cd to fail the mod.

k8s.io/api@v0.0.0: reading k8s.io/api/go.mod at revision v0.0.0: unknown revision v0.0.0

There are two places that are using the kubernetes package directly which should be replaced.
https://github.com/argoproj/argo-cd/search?q=k8s.io%2Fkubernetes

To Reproduce

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Expected behavior

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Version

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[wanghong230]

The workaround is quite painful: kubernetes/kubernetes#79384 (comment)

[jessesuen]

Relevant argoproj/gitops-engine#56

[jessesuen]

Here's a useful script to update k8s dependencies in go.mod

https://github.com/argoproj/argo-rollouts/blob/master/hack/update-k8s-dependencies.sh