Bump hibernate-validator from 5.3.5.Final to 5.3.6.Final (#12085)

Pick from https://github.com/vaadin/framework/pull/12084

pom.xml

@@ -229,7 +229,7 @@
             <dependency>
                 <groupId>org.hibernate</groupId>
                 <artifactId>hibernate-validator</artifactId>
-                <version>5.3.5.Final</version>
+                <version>5.3.6.Final</version>
             </dependency>
             <dependency>
                 <groupId>org.jsoup</groupId>