Remove @Configuration meta-annotation from @Enable*Session annotations

Closes gh-1361

spring-session-samples/spring-session-sample-javaconfig-jdbc/src/main/java/sample/Config.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.
@@ -19,6 +19,7 @@ package sample;
 import javax.sql.DataSource;
 
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
 import org.springframework.jdbc.datasource.DataSourceTransactionManager;
 import org.springframework.jdbc.datasource.embedded.EmbeddedDatabase;
 import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder;
@@ -27,6 +28,7 @@ import org.springframework.session.jdbc.config.annotation.web.http.EnableJdbcHtt
 import org.springframework.transaction.PlatformTransactionManager;
 
 // tag::class[]
+@Configuration(proxyBeanMethods = false)
 @EnableJdbcHttpSession // <1>
 public class Config {