Upgrade Mockito, Spring versions

Author: garyrussell

build.gradle

@@ -59,12 +59,12 @@ ext {
 	kafkaVersion = '2.6.0'
 	log4jVersion = '2.13.2'
 	micrometerVersion = '1.5.2'
-	mockitoVersion = '3.3.3'
+	mockitoVersion = '3.4.6'
 	reactorVersion = 'Dysprosium-SR9'
 	scalaVersion = '2.13'
 	springDataCommonsVersion = '2.3.1.RELEASE'
 	springRetryVersion = '1.3.0'
-	springVersion = '5.2.7.RELEASE'
+	springVersion = '5.3.0-M2'
 
 	idPrefix = 'kafka'
 }