Upgrade to Neo4j Ogm 2.1.6

Closes gh-11694

spring-boot-dependencies/pom.xml

@@ -137,7 +137,7 @@
 		<mysql.version>5.1.45</mysql.version>
 		<narayana.version>5.5.31.Final</narayana.version>
 		<nekohtml.version>1.9.22</nekohtml.version>
-		<neo4j-ogm.version>2.1.5</neo4j-ogm.version>
+		<neo4j-ogm.version>2.1.6</neo4j-ogm.version>
 		<postgresql.version>9.4.1212.jre7</postgresql.version>
 		<querydsl.version>4.1.4</querydsl.version>
 		<reactor.version>2.0.8.RELEASE</reactor.version>