Fix sonar findings (#2572)

Signed-off-by: Avgustin Marinov <Avgustin.Marinov@bosch.com>

hawkbit-ddi/hawkbit-ddi-api/src/main/java/org/eclipse/hawkbit/ddi/json/model/DdiAssignedVersion.java

@@ -14,7 +14,6 @@ import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import io.swagger.v3.oas.annotations.media.Schema;
 import lombok.Data;
-import lombok.Getter;
 
 /**
  * Allow a target to declare running distribution set version