Bump hibernate-validator in /aws-serverless-java-container-spring (#379)

Bumps [hibernate-validator](https://github.com/hibernate/hibernate-validator) from 5.4.1.Final to 5.4.2.Final.
- [Release notes](https://github.com/hibernate/hibernate-validator/releases)
- [Changelog](https://github.com/hibernate/hibernate-validator/blob/5.4.2.Final/changelog.txt)
- [Commits](hibernate/hibernate-validator@5.4.1.Final...5.4.2.Final)

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Author: dependabot[bot]

aws-serverless-java-container-spring/pom.xml

@@ -72,7 +72,7 @@
         <dependency>
             <groupId>org.hibernate</groupId>
             <artifactId>hibernate-validator</artifactId>
-            <version>5.4.1.Final</version>
+            <version>5.4.2.Final</version>
             <scope>test</scope>
         </dependency>