chore(deps): update gcr.io/google.com/cloudsdktool/google-cloud-cli docker tag to v519 (#439)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| gcr.io/google.com/cloudsdktool/google-cloud-cli | final | major |
`517.0.0-emulators` -> `519.0.0-emulators` |

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Dockerfile.pubsub-emulator

@@ -1,3 +1,3 @@
 # gcloud sdk for pubsub emulator with netcat added for the startup health check
-FROM gcr.io/google.com/cloudsdktool/google-cloud-cli:517.0.0-emulators@sha256:5204ce4b58f226b843d5874285444d4494236f79d76ec2a1bf19b04440e83fdf
+FROM gcr.io/google.com/cloudsdktool/google-cloud-cli:519.0.0-emulators@sha256:78db84c1d8be6fd2282789f7b8a57b5627ab0b1182a6dd0110b86c3fef078ee4
 RUN apt-get update -y && apt-get install -y netcat-traditional