Upgrade versions; prepare for release

Author: garyrussell

build.gradle

@@ -67,8 +67,8 @@ ext {
 	scalaVersion = '2.13'
 	springBootVersion = '2.4.13' // docs module
 	springDataVersion = '2021.0.10'
-	springRetryVersion = '1.3.2'
-	springVersion = '5.3.17'
+	springRetryVersion = '1.3.3'
+	springVersion = '5.3.18'
 
 	idPrefix = 'kafka'
 }