Fix imports.

Author: OlgaMaciaszek

spring-cloud-openfeign-core/src/main/java/org/springframework/cloud/openfeign/FeignClientsRegistrar.java

@@ -32,6 +32,7 @@
 import feign.Request;
 
 import org.springframework.aop.scope.ScopedProxyUtils;
+import org.springframework.beans.factory.FactoryBean;
 import org.springframework.beans.factory.annotation.AnnotatedBeanDefinition;
 import org.springframework.beans.factory.annotation.AnnotatedGenericBeanDefinition;
 import org.springframework.beans.factory.config.BeanDefinition;