deps: update dependency com.google.cloud:google-cloud-core to v2.1.7 (#911)
deps: update dependency com.google.cloud:google-cloud-core to v2.1.7 (#911)


GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples,GoogleCloudPlatform/java-docs-samples