Update :servlet:spring-boot:java:authentication:username-password to 7

servlet/spring-boot/java/authentication/username-password/mfa/src/main/java/example/SecurityConfig.java

@@ -23,7 +23,7 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.security.authorization.AuthorizationDecision;
 import org.springframework.security.authorization.AuthorizationManager;
-import org.springframework.security.config.annotation.ObjectPostProcessor;
+import org.springframework.security.config.ObjectPostProcessor;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
 import org.springframework.security.crypto.encrypt.AesBytesEncryptor;
 import org.springframework.security.crypto.factory.PasswordEncoderFactories;