Update to Spring Data 1.13.23

Closes gh-555

Author: rwinch

gradle/java.gradle

@@ -6,7 +6,7 @@ targetCompatibility = '1.6'
 
 ext.apacheDsVersion = '1.5.5'
 ext.springVersion = '4.3.27.RELEASE'
-ext.springDataVersion = '1.13.18.RELEASE'
+ext.springDataVersion = '1.13.23.RELEASE'
 ext.springDataSpring3Version = '1.10.2.RELEASE'
 ext.springBatchVersion = '2.0.4.RELEASE'
 ext.junitVersion =  '4.12'