build(deps): Bump google/cloud-sdk from 505.0.0 to 506.0.0

Bumps google/cloud-sdk from 505.0.0 to 506.0.0.

---
updated-dependencies:
- dependency-name: google/cloud-sdk
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Dockerfile.pubsub-emulator

@@ -1,3 +1,3 @@
 # gcloud sdk for pubsub emulator with netcat added for the startup health check
-FROM google/cloud-sdk:505.0.0@sha256:3a24ff5f089d9ce3627306873ef1e1061488a63ae12c0bd0b5c24ec5ee594798
+FROM google/cloud-sdk:506.0.0@sha256:a71bb1233f086706c1bf70f091d82067349ebff7f054a6c14f50c02c0f2a1a35
 RUN apt-get install -y netcat-traditional