Upgrade to Hibernate Validator 5.2.4.Final

Closes gh-5220

Author: wilkinsona

spring-boot-dependencies/pom.xml

@@ -77,7 +77,7 @@
 		<hamcrest.version>1.3</hamcrest.version>
 		<hazelcast.version>3.5.5</hazelcast.version>
 		<hibernate.version>4.3.11.Final</hibernate.version>
-		<hibernate-validator.version>5.2.2.Final</hibernate-validator.version>
+		<hibernate-validator.version>5.2.4.Final</hibernate-validator.version>
 		<hikaricp.version>2.4.3</hikaricp.version>
 		<hikaricp-java6.version>2.3.13</hikaricp-java6.version>
 		<hornetq.version>2.4.7.Final</hornetq.version>