build(deps): Bump google.com/cloudsdktool/google-cloud-cli

Bumps google.com/cloudsdktool/google-cloud-cli from 555.0.0-emulators to 556.0.0-emulators.

---
updated-dependencies:
- dependency-name: google.com/cloudsdktool/google-cloud-cli
  dependency-version: 556.0.0-emulators
  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 gcr.io/google.com/cloudsdktool/google-cloud-cli:555.0.0-emulators@sha256:0e4e6c1ef3bbee200003506dbefa9fd69c68fd666971e19ae24414aa1834ea2e
+FROM gcr.io/google.com/cloudsdktool/google-cloud-cli:556.0.0-emulators@sha256:75425994dbf3b747cd4b47d382e627651ce3bbcafc16433f38e380d9ceaeadcc
 RUN apt-get update -y && apt-get install -y netcat-traditional