Upgrade versions; prepare for release

Author: garyrussell

build.gradle

@@ -61,14 +61,14 @@ ext {
 	junitJupiterVersion = '5.8.2'
 	kafkaVersion = '3.0.0'
 	log4jVersion = '2.17.1'
-	micrometerVersion = '1.8.1'
+	micrometerVersion = '1.8.3'
 	mockitoVersion = '4.0.0'
-	reactorVersion = '2020.0.15'
+	reactorVersion = '2020.0.16'
 	scalaVersion = '2.13'
-	springBootVersion = '2.5.8' // docs module
-	springDataVersion = '2021.1.1'
+	springBootVersion = '2.5.9' // docs module
+	springDataVersion = '2021.1.2'
 	springRetryVersion = '1.3.1'
-	springVersion = '5.3.15'
+	springVersion = '5.3.16'
 	zookeeperVersion = '3.6.3'
 
 	idPrefix = 'kafka'