removed not needed import

Author: hhund

dsf-fhir/dsf-fhir-server/src/main/java/dev/dsf/fhir/spring/config/AdapterConfig.java

@@ -5,7 +5,6 @@
 import java.util.List;
 
 import org.hl7.fhir.r4.model.CodeSystem;
-import org.hl7.fhir.r4.model.DocumentReference;
 import org.hl7.fhir.r4.model.Library;
 import org.hl7.fhir.r4.model.Measure;
 import org.hl7.fhir.r4.model.Questionnaire;