Bug: Fix apiVersion for backend-dev.yaml

[BlackDark]

Throws an error in jenkins while deploying. Happens in qwiklabs lab: google.qwiklabs.com/focuses/1104

java.io.IOException: Failed to launch command args: [kubectl, --kubeconfig, /home/jenkins/agent/workspace/sample-app_new-feature@tmp/.kube3020155600159179657config, apply, --namespace, new-feature, -f, /home/jenkins/agent/workspace/sample-app_new-feature/k8s/dev], status: 1. Logs: resourcequota/default created
deployment.apps/gceme-frontend-dev created
error: unable to recognize "/home/jenkins/agent/workspace/sample-app_new-feature/k8s/dev/backend-dev.yaml": no matches for kind "Deployment" in version "app/v1"

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[BlackDark]

@googlebot I signed it!

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[viglesiasce]

Thanks @BlackDark