Update SF to snapshot

Author: garyrussell

build.gradle

@@ -138,7 +138,7 @@ subprojects { subproject ->
 		springGemfireVersion = '2.1.1.RELEASE'
 		springSecurityVersion = '5.1.0.RELEASE'
 		springRetryVersion = '1.2.2.RELEASE'
-		springVersion = project.hasProperty('springVersion') ? project.springVersion : '5.1.1.RELEASE'
+		springVersion = project.hasProperty('springVersion') ? project.springVersion : '5.1.2.BUILD-SNAPSHOT'
 		springWsVersion = '3.0.3.RELEASE'
 		tomcatVersion = "9.0.12"
 		xmlUnitVersion = '1.6'