build(deps): Bump google/cloud-sdk from 469.0.0 to 470.0.0

Bumps google/cloud-sdk from 469.0.0 to 470.0.0.

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

Signed-off-by: dependabot[bot] <support@github.com>

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:469.0.0@sha256:36d2d9e8660175fe3cbd053483bbf7ed4c77b7be3d109c5de7057b1216c3fe5d
+FROM google/cloud-sdk:470.0.0@sha256:869c6e0b48a6f0eda09c2f6514b2c9f008a37d3ccafb03f564b8aa8d37c5c8bf
 RUN apt-get install -y netcat