Make replyContainer as bean in Kafka tests

It looks like `replyContainer()` is not registered as a bean,
so its lifecycle is somehow out of application context control

* Mark `replyContainer()` method as a `@Bean` in the `KafkaDslTests` and `KafkaDslKotlinTests`
to see if this fixes flaky state of the test suite
* Upgrade to Kotlin `1.7.20` and fix `KafkaDslKotlinTests` according to its requirements

Author: artembilan

build.gradle

@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlinVersion = '1.7.10'
+    ext.kotlinVersion = '1.7.20'
     ext.isCI = System.getenv('GITHUB_ACTION') || System.getenv('bamboo_buildKey')
     repositories {
         mavenCentral()

spring-integration-kafka/src/test/java/org/springframework/integration/kafka/dsl/KafkaDslTests.java

@@ -445,7 +445,8 @@ public BroadcastCapableChannel pubSub(KafkaTemplate<Integer, String> template,
 					.get();
 		}
 
-		private GenericMessageListenerContainer<Integer, String> replyContainer() {
+		@Bean
+		public GenericMessageListenerContainer<Integer, String> replyContainer() {
 			ContainerProperties containerProperties = new ContainerProperties(TEST_TOPIC5);
 			containerProperties.setGroupId("outGate");
 			containerProperties.setConsumerRebalanceListener(new ConsumerRebalanceListener() {

spring-integration-kafka/src/test/kotlin/org/springframework/integration/kafka/dsl/kotlin/KafkaDslKotlinTests.kt

@@ -190,7 +190,7 @@ class KafkaDslKotlinTests {
 
 	@Test
 	fun testGateways() {
-		assertThat(this.config.replyContainerLatch.await(30, TimeUnit.SECONDS))
+		assertThat(this.config.replyContainerLatch.await(30, TimeUnit.SECONDS)).isTrue()
 		assertThat(this.gate.exchange(TEST_TOPIC4, "foo")).isEqualTo("FOO")
 	}
 
@@ -292,7 +292,7 @@ class KafkaDslKotlinTests {
 
 		private fun kafkaMessageHandler(producerFactory: ProducerFactory<Int, String>, topic: String) =
 			Kafka.outboundChannelAdapter(producerFactory)
-				.messageKey { it.headers[IntegrationMessageHeaderAccessor.SEQUENCE_NUMBER] }
+				.messageKey<Any> { it.headers[IntegrationMessageHeaderAccessor.SEQUENCE_NUMBER] }
 				.headerMapper(mapper())
 				.sync(true)
 				.partitionId<Any> { 0 }
@@ -326,7 +326,8 @@ class KafkaDslKotlinTests {
 				)
 			}
 
-		private fun replyContainer(): GenericMessageListenerContainer<Int, String> {
+		@Bean
+		fun replyContainer(): GenericMessageListenerContainer<Int, String> {
 			val containerProperties = ContainerProperties(TEST_TOPIC5)
 			containerProperties.setGroupId("kotlinOutGate")
 			containerProperties.setConsumerRebalanceListener(object : ConsumerRebalanceListener {