Upgrade to Kafka 2.5.0

Closes gh-21032

Author: snicoll

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/kafka/KafkaPropertiesTests.java

@@ -33,8 +33,7 @@ class KafkaPropertiesTests {
 
 	@Test
 	void isolationLevelEnumConsistentWithKafkaVersion() {
-		org.apache.kafka.common.requests.IsolationLevel[] original = org.apache.kafka.common.requests.IsolationLevel
-				.values();
+		org.apache.kafka.common.IsolationLevel[] original = org.apache.kafka.common.IsolationLevel.values();
 		assertThat(original).extracting("name").containsExactly(IsolationLevel.READ_UNCOMMITTED.name(),
 				IsolationLevel.READ_COMMITTED.name());
 		assertThat(original).extracting("id").containsExactly(IsolationLevel.READ_UNCOMMITTED.id(),

spring-boot-project/spring-boot-dependencies/build.gradle

@@ -967,7 +967,7 @@ bom {
 			]
 		}
 	}
-	library("Kafka", "2.4.1") {
+	library("Kafka", "2.5.0") {
 		group("org.apache.kafka") {
 			modules = [
 				"connect-api",