add codeowner (#10457)

.github/CODEOWNERS

@@ -19,6 +19,7 @@
 /deploy/ @kezhenxu94 @caishunfeng
 /dolphinscheduler-alert/ @kezhenxu94 @caishunfeng
 /dolphinscheduler-e2e/ @kezhenxu94 @SbloodyS
+/dolphinscheduler-api-test/ @SbloodyS
 /dolphinscheduler-registry/ @kezhenxu94 @caishunfeng
 /dolphinscheduler-api/ @caishunfeng
 /dolphinscheduler-dao/ @caishunfeng