Bump to go 1.20

[koba1t]

#5174

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[koba1t]

Hi @natasha41575

I think the prow check is passed.
Could you check and please tell me if you have a point that is needed to test?

[koba1t]

kubernetes/kube-openapi#402
kube-openapi is breaking change its dependencies.

# sigs.k8s.io/kustomize/kyaml/openapi
../pkg/mod/sigs.k8s.io/kustomize/kyaml@v0.13.7/openapi/openapi.go:656:33: cannot use doc (variable of type *"github.com/google/gnostic/openapiv2".Document) as *"github.com/google/gnostic-models/openapiv2".Document value in argument to swagger.FromGnostic

Looks like github.com/google/gnostic conflicting to github.com/google/gnostic-models.

[koba1t]

I understand what happens on tests.
I think gnostic dependencies are already updated at master. #5186
But, the New kyaml tag is not released yet, and the e2econtainer test had dependencies for old kyaml that are not updated gnostic dependencies.

I think I was finished fixing that failing test.

[natasha41575]

/lgtm

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