fix: add @OverRide annotation (closes #6516)

The method deleteSchemaMetasByLegacyTimeline (SchemaMetaPostgreSQLProvider.java) was missing the @OverRide annotation.

core/src/main/java/org/apache/gravitino/storage/relational/mapper/provider/postgresql/SchemaMetaPostgreSQLProvider.java

@@ -83,6 +83,7 @@ public String softDeleteSchemaMetasByCatalogId(Long catalogId) {
         + " WHERE catalog_id = #{catalogId} AND deleted_at = 0";
   }
 
+  @Override
   public String deleteSchemaMetasByLegacyTimeline(
       @Param("legacyTimeline") Long legacyTimeline, @Param("limit") int limit) {
     return "DELETE FROM "