Upgrade Spring, Data, Retry, Reactor, Micrometer

Author: garyrussell

build.gradle

@@ -67,15 +67,15 @@ ext {
 	kafkaVersion = '3.5.1'
 	log4jVersion = '2.20.0'
 	micrometerDocsVersion = "1.0.2"
-	micrometerVersion = '1.12.0-SNAPSHOT'
-	micrometerTracingVersion = '1.2.0-SNAPSHOT'
+	micrometerVersion = '1.12.0-M3'
+	micrometerTracingVersion = '1.2.0-M3'
 	mockitoVersion = '5.5.0'
-	reactorVersion = '2023.0.0-M2'
+	reactorVersion = '2023.0.0-M3'
 	scalaVersion = '2.13'
 	springBootVersion = '3.0.9' // docs module
-	springDataVersion = '2023.1.0-SNAPSHOT'
-	springRetryVersion = '2.0.2'
-	springVersion = '6.1.0-SNAPSHOT'
+	springDataVersion = '2023.1.0-M3'
+	springRetryVersion = '2.0.3'
+	springVersion = '6.1.0-M5'
 	zookeeperVersion = '3.6.4'
 
 	idPrefix = 'kafka'

spring-kafka/src/main/java/org/springframework/kafka/support/KafkaMessageHeaderAccessor.java

@@ -48,7 +48,6 @@ public KafkaMessageHeaderAccessor(Message<?> message) {
 	 * @throws IllegalStateException if the header is not present.
 	 * @see org.springframework.kafka.listener.ContainerProperties#setDeliveryAttemptHeader(boolean)
 	 */
-	@Nullable
 	public int getBlockingRetryDeliveryAttempt() {
 		Assert.state(getHeader(KafkaHeaders.DELIVERY_ATTEMPT) != null,
 				"Blocking delivery attempt header not present, "