Update integration tests

This commit updates versions of RDBMS and Redis Docker images used in
integration tests.

Closes gh-894

samples/javaconfig/redis/src/main/java/sample/EmbeddedRedisConfig.java

@@ -30,7 +30,7 @@ import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactor
 @Profile("embedded-redis")
 public class EmbeddedRedisConfig {
 
-	private static final String REDIS_DOCKER_IMAGE = "redis:3.2.9";
+	private static final String REDIS_DOCKER_IMAGE = "redis:4.0.2";
 
 	@Bean(initMethod = "start")
 	public GenericContainer redisContainer() {