fix spotless

Author: derrickaw

sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/TableRowJsonCoder.java

@@ -28,7 +28,6 @@
 import org.apache.beam.sdk.coders.AtomicCoder;
 import org.apache.beam.sdk.coders.Coder;
 import org.apache.beam.sdk.coders.StringUtf8Coder;
-import org.apache.beam.sdk.util.RowJson;
 import org.apache.beam.sdk.util.RowJsonUtils;
 import org.apache.beam.sdk.values.TypeDescriptor;