Downgraded Hibernate because of non-compatibility

See spring-projects/spring-data-jpa#2472

Author: oharsta

pom.xml

@@ -4,7 +4,7 @@
 
     <groupId>org.openconext</groupId>
     <artifactId>teams</artifactId>
-    <version>9.0.2</version>
+    <version>9.0.2-SNAPSHOT</version>
     <packaging>pom</packaging>
 
     <name>teams</name>

teams-server/pom.xml

@@ -71,6 +71,7 @@
         <dependency>
             <groupId>org.hibernate</groupId>
             <artifactId>hibernate-core</artifactId>
+            <version>5.6.5.Final</version>
         </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.datatype</groupId>