chore(deps): update dependency com.google.cloud:google-cloud-spanner-jdbc to v1.15.0
chore(deps): update dependency com.google.cloud:google-cloud-spanner-jdbc to v1.15.0

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