Upgrade versions; prepared for release

Author: garyrussell

build.gradle

@@ -61,14 +61,14 @@ ext {
 	junitJupiterVersion = '5.8.2'
 	kafkaVersion = '3.0.1'
 	log4jVersion = '2.17.2'
-	micrometerVersion = '1.8.4'
+	micrometerVersion = '1.8.5'
 	mockitoVersion = '4.0.0'
-	reactorVersion = '2020.0.17'
+	reactorVersion = '2020.0.18'
 	scalaVersion = '2.13'
 	springBootVersion = '2.5.10' // docs module
 	springDataVersion = '2021.1.3'
-	springRetryVersion = '1.3.2'
-	springVersion = '5.3.17'
+	springRetryVersion = '1.3.3'
+	springVersion = '5.3.19'
 	zookeeperVersion = '3.6.3'
 
 	idPrefix = 'kafka'