Use more specific WebSecurityConfigurer @Bean type

Update ManagementSecurityAutoConfiguration to return
IgnoredPathsWebSecurityConfigurerAdapter rather than
WebSecurityConfigurer<WebSecurity>.

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/autoconfigure/ManagementSecurityAutoConfiguration.java

@@ -81,7 +81,7 @@ public class ManagementSecurityAutoConfiguration {
 
 	@Bean
 	@ConditionalOnMissingBean({ IgnoredPathsWebSecurityConfigurerAdapter.class })
-	public WebSecurityConfigurer<WebSecurity> ignoredPathsWebSecurityConfigurerAdapter() {
+	public IgnoredPathsWebSecurityConfigurerAdapter ignoredPathsWebSecurityConfigurerAdapter() {
 		return new IgnoredPathsWebSecurityConfigurerAdapter();
 	}