fix: use openapiv3 config in sample-apiserver

[takirala]

Ref: https://github.com/kubernetes/apiserver/commit/3783e4af68fb8ac97c334eaf3c5cf8d3313f55bd

apiserver has required openapiv3 config since v0.27.x release - See https://github.com/kubernetes/apiserver/blob/v0.27.0/pkg/server/genericapiserver.go#L957-L960

vs the v0.26.x release: https://github.com/kubernetes/apiserver/blob/v0.26.13/pkg/server/genericapiserver.go#L873

After upgrading the apiserver to v0.27.x in #95 the upgrade broke the sample-apiserver. As of now, it is still possible to use sample-apiserver by customizing it but it would be nice to make it work out of the box. This change updates the setter to use openapi v3 config.

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[takirala]

Synced with #104

[jimmidyson]

/lgtm

[jimmidyson]

/assign @pwittrock

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