Update to Spring Data Moore-SR6

Fixes gh-8248

gradle/dependency-management.gradle

@@ -7,7 +7,7 @@ if (!project.hasProperty('springVersion')) {
 }
 
 if (!project.hasProperty('springDataVersion')) {
-	ext.springDataVersion = 'Moore-SR3'
+	ext.springDataVersion = 'Moore-SR6'
 }
 
 ext.rsocketVersion = '1.0.0-RC5'