Upgrade to Hibernate ORM 5.2.6

Author: jhoeller

build.gradle

@@ -46,7 +46,7 @@ configure(allprojects) { project ->
 	ext.hamcrestVersion      = "1.3"
 	ext.hibernate3Version    = "3.6.10.Final"
 	ext.hibernate4Version    = "4.3.11.Final"
-	ext.hibernate5Version    = "5.2.5.Final"
+	ext.hibernate5Version    = "5.2.6.Final"
 	ext.hibval4Version       = "4.3.2.Final"
 	ext.hibval5Version       = "5.2.4.Final"
 	ext.hsqldbVersion        = "2.3.4"