chore(deps): bump google/cloud-sdk in /.dev/datastore (#1126)

Bumps google/cloud-sdk from 507.0.0-emulators to 508.0.0-emulators.

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

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Author: dependabot[bot]

.dev/datastore/Dockerfile

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM google/cloud-sdk:507.0.0-emulators
+FROM google/cloud-sdk:508.0.0-emulators
 
 # https://cloud.google.com/datastore/docs/tools/datastore-emulator
 ENTRYPOINT [ "gcloud", "beta", "emulators", "datastore", "start", "--host-port=0.0.0.0:8086", "--project=local", "--log-http", "--verbosity=debug", "--use-firestore-in-datastore-mode" ]