Fix Spring Security configuration in tests

As of spring-projects/spring-security#11653, Spring Security's [at]Enable*Security annotations are not meta annotated with [at]Configuration which breaks some of our tests.

This commit adds missing [at]Configuration annotations where needed.

Closes gh-2118

spring-session-samples/spring-session-sample-javaconfig-rest/src/main/java/sample/SecurityConfig.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2019 the original author or authors.
+ * Copyright 2014-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,6 +17,7 @@
 package sample;
 
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Configuration;
 import org.springframework.security.config.Customizer;
 import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
@@ -25,6 +26,7 @@ import org.springframework.security.config.annotation.web.configuration.WebSecur
 import org.springframework.security.core.userdetails.User;
 import org.springframework.security.web.savedrequest.NullRequestCache;
 
+@Configuration(proxyBeanMethods = false)
 @EnableWebSecurity
 public class SecurityConfig extends WebSecurityConfigurerAdapter {