Update to Reactor Dysprosium-M1

Fixes gh-6867

Jenkinsfile

@@ -48,7 +48,7 @@ try {
 			node {
 				checkout scm
 				try {
-					sh "./gradlew clean test -PforceMavenRepositories=snapshot -PspringVersion='5.+' -PreactorVersion=Californium-BUILD-SNAPSHOT -PspringDataVersion=Lovelace-BUILD-SNAPSHOT --refresh-dependencies --no-daemon --stacktrace"
+					sh "./gradlew clean test -PforceMavenRepositories=snapshot -PspringVersion='5.+' -PreactorVersion=Dysprosium-BUILD-SNAPSHOT -PspringDataVersion=Lovelace-BUILD-SNAPSHOT --refresh-dependencies --no-daemon --stacktrace"
 				} catch(Exception e) {
 					currentBuild.result = 'FAILED: snapshots'
 					throw e

gradle/dependency-management.gradle

@@ -1,5 +1,5 @@
 if (!project.hasProperty('reactorVersion')) {
-	ext.reactorVersion = 'Californium-SR6'
+	ext.reactorVersion = 'Dysprosium-M1'
 }
 
 if (!project.hasProperty('springVersion')) {