Upgrade to Kafka 2.3.1

Closes spring-projectsgh-18796

Author: snicoll

spring-boot-project/spring-boot-dependencies/pom.xml

@@ -142,7 +142,7 @@
 		<jtds.version>1.3.1</jtds.version>
 		<junit.version>4.12</junit.version>
 		<junit-jupiter.version>5.5.2</junit-jupiter.version>
-		<kafka.version>2.3.0</kafka.version>
+		<kafka.version>2.3.1</kafka.version>
 		<kotlin.version>1.3.50</kotlin.version>
 		<kotlin-coroutines.version>1.3.2</kotlin-coroutines.version>
 		<lettuce.version>5.2.0.RELEASE</lettuce.version>