Some fixes for current code base state

* Fix `KafkaAdmin` to use `Collections.singletonMap()` instead of
`Map.of()` which is not available for Java 8 yet
* Fix `DefaultErrorHandlerNoSeeksRecordAckNoResumeTests` for the current `RecordInterceptor` lambda

Author: garyrussell

spring-kafka/src/main/java/org/springframework/kafka/core/KafkaAdmin.java

@@ -342,8 +342,9 @@ private void adjustConfigMismatches(AdminClient adminClient, Collection<NewTopic
 					}
 					if (alterConfigOperations.size() > 0) {
 						try {
-							AlterConfigsResult alterConfigsResult = adminClient
-									.incrementalAlterConfigs(Map.of(topicConfigResource, alterConfigOperations));
+							AlterConfigsResult alterConfigsResult =
+									adminClient.incrementalAlterConfigs(
+											Collections.singletonMap(topicConfigResource, alterConfigOperations));
 							alterConfigsResult.all().get(this.operationTimeout, TimeUnit.SECONDS);
 						}
 						catch (InterruptedException ie) {

spring-kafka/src/test/java/org/springframework/kafka/listener/DefaultErrorHandlerNoSeeksRecordAckNoResumeTests.java

@@ -227,7 +227,7 @@ ConcurrentKafkaListenerContainerFactory kafkaListenerContainerFactory(KafkaListe
 			factory.setConsumerFactory(consumerFactory(registry));
 			factory.getContainerProperties().setAckMode(AckMode.RECORD);
 			factory.getContainerProperties().setDeliveryAttemptHeader(true);
-			factory.setRecordInterceptor((record, consumer) -> {
+			factory.setRecordInterceptor((record) -> {
 				Config.this.deliveryAttempt = record.headers().lastHeader(KafkaHeaders.DELIVERY_ATTEMPT);
 				return record;
 			});