migrate apps/v1beta1 to apps/v1

[supirman]

The current YAML is failed to create the deployment because the GKE's Kubernetes latest version is 1.16. In 1.16 apps/v1beta1 API is removed [1]

[1] https://kubernetes.io/blog/2019/07/18/api-deprecations-in-1-16/

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[supirman]

@googlebot I signed it!

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[jeffywu]

Can someone approve this so it can be merged?