Upgrade versions; prepare for milestone release

Author: garyrussell

build.gradle

@@ -60,9 +60,9 @@ ext {
 	log4jVersion = '2.13.2'
 	micrometerVersion = '1.5.2'
 	mockitoVersion = '3.4.6'
-	reactorVersion = 'Dysprosium-SR9'
+	reactorVersion = 'Dysprosium-SR10'
 	scalaVersion = '2.13'
-	springDataCommonsVersion = '2.3.1.RELEASE'
+	springDataCommonsVersion = '2.4.0-M2'
 	springRetryVersion = '1.3.0'
 	springVersion = '5.3.0-M2'