fix: Make Basemap serializable (#23882)

Author: maikelarabori

dhis-2/dhis-api/src/main/java/org/hisp/dhis/mapping/Basemap.java

@@ -33,14 +33,15 @@
 
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlProperty;
+import java.io.Serializable;
 import lombok.Data;
 import lombok.EqualsAndHashCode;
 import lombok.NoArgsConstructor;
 
 @Data
 @NoArgsConstructor
 @EqualsAndHashCode
-public class Basemap {
+public class Basemap implements Serializable {
 
   @JsonProperty
   @JacksonXmlProperty(namespace = DXF_2_0)