chore(deps): update dependency com.google.cloud:google-cloud-spanner to v1.56.0 (#285)
chore(deps): update dependency com.google.cloud:google-cloud-spanner to v1.56.0 (#285)


googleapis/java-spanner,looker-open-source/java-spanner,googleapis/java-spanner,googleapis/java-spanner,looker-open-source/java-spanner,looker-open-source/java-spanner