Update google/cloud-sdk Docker tag to v488 (#312)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| google/cloud-sdk
([changelog](https://cloud.google.com/sdk/docs/release-notes)) | final |
major | `470.0.0` -> `488.0.0` |

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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 google/cloud-sdk:470.0.0@sha256:869c6e0b48a6f0eda09c2f6514b2c9f008a37d3ccafb03f564b8aa8d37c5c8bf
+FROM google/cloud-sdk:488.0.0@sha256:6062aa734ab20faa58adee33c216fc473ce38ccd4dbeaadf7997dfa9b5bfcabe
 RUN apt-get install -y netcat