Fix checkstyle violation

Author: grzegorz8

flink-connector-jdbc-postgres/src/main/java/org/apache/flink/connector/jdbc/postgres/database/dialect/PostgresDialectConverter.java

@@ -27,6 +27,7 @@
 import org.apache.flink.table.types.logical.LogicalTypeRoot;
 import org.apache.flink.table.types.logical.RowType;
 import org.apache.flink.table.types.logical.utils.LogicalTypeUtils;
+
 import org.postgresql.util.PGobject;
 
 import java.lang.reflect.Array;