remove unused import #2715 (#2718)

Co-authored-by: dailidong <dailidong66@gmail.com>
Co-authored-by: gabry.wu <8545796+gabrywu@users.noreply.github.com>

dolphinscheduler-api/src/test/java/org/apache/dolphinscheduler/api/service/UsersServiceTest.java

@@ -18,7 +18,6 @@ package org.apache.dolphinscheduler.api.service;
 
 import com.baomidou.mybatisplus.core.metadata.IPage;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
-import org.apache.avro.generic.GenericData;
 import org.apache.dolphinscheduler.api.enums.Status;
 import org.apache.dolphinscheduler.api.utils.PageInfo;
 import org.apache.dolphinscheduler.api.utils.Result;