Update frontend.yaml

[faisaliqkhan]

There was an error when I was doing a lab based on this file in Qwikilabs.

The error was :
error: unable to recognise “deployments/auth.yank”. no matches for kind “Deployment” in version “extensions/v1beta”

So I made changed in the apiVersion line
and then added 3 lines in the sec: after replicas 1
aiming at the proper selector.

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[faisaliqkhan]

@googlebot I signed it!