Remove unused import

config/src/main/java/org/springframework/security/config/authentication/AuthenticationManagerFactoryBean.java

@@ -26,7 +26,6 @@ import org.springframework.beans.factory.BeanFactoryAware;
 import org.springframework.beans.factory.FactoryBean;
 import org.springframework.beans.factory.NoSuchBeanDefinitionException;
 import org.springframework.security.authentication.AuthenticationManager;
-import org.springframework.security.authentication.AuthenticationProvider;
 import org.springframework.security.authentication.ObservationAuthenticationManager;
 import org.springframework.security.authentication.ProviderManager;
 import org.springframework.security.authentication.dao.DaoAuthenticationProvider;