build(pom.xml): update hibernate-validator to 5.4.2.Final.

Changelogs:
- http://in.relation.to/2016/12/08/hibernate-validator-540-beta1-and-534-final-out/
- http://in.relation.to/2017/01/12/hibernate-validator-540-cr1-final-out/
- http://in.relation.to/2017/02/02/hibernate-validator-540-final-out/
- http://in.relation.to/2017/03/23/hibernate-validator-541-final-out/
- https://hibernate.atlassian.net/browse/HV-1498?jql=project%20%3D%20HV%20AND%20fixVersion%20in%20(5.4.2.Final)%20ORDER%20BY%20updated

No functional changes.

Author: php-coder

pom.xml

@@ -508,7 +508,7 @@
 		<hamcrest.version>1.3</hamcrest.version>
 
 		<!-- Redefine default value from spring-boot-dependencies (https://github.com/spring-projects/spring-boot/blob/v1.5.16.RELEASE/spring-boot-dependencies/pom.xml) -->
-		<hibernate-validator.version>5.3.6.Final</hibernate-validator.version>
+		<hibernate-validator.version>5.4.2.Final</hibernate-validator.version>
 
 		<jacoco.plugin.version>0.8.2</jacoco.plugin.version>
 		<jasmine.plugin.version>2.2</jasmine.plugin.version>