Add keepAlive(true) to testing Redis CF

Author: artembilan

spring-integration-redis/src/test/java/org/springframework/integration/redis/rules/RedisAvailableRule.java

@@ -52,6 +52,7 @@ protected static void setupConnectionFactory() {
 								.socketOptions(
 										SocketOptions.builder()
 												.connectTimeout(Duration.ofMillis(10000))
+												.keepAlive(true)
 												.build())
 								.build())
 				.commandTimeout(Duration.ofSeconds(10000))