OZG-6990 set field to private

archive-manager-server/src/test/java/de/ozgcloud/archive/common/callcontext/CallContextGrpcServerInterceptorTest.java

@@ -44,7 +44,7 @@ import io.grpc.ServerCall;
 class CallContextGrpcServerInterceptorTest {
 
 	@InjectMocks
-	CallContextGrpcServerInterceptor interceptor;
+	private CallContextGrpcServerInterceptor interceptor;
 
 	@Mock
 	private CurrentUserService currentUserService;