Bump hibernate-validator in /3-extensions/protocol/dubbo-samples-rest

Bumps hibernate-validator from 4.2.0.Final to 6.0.23.Final.

---
updated-dependencies:
- dependency-name: org.hibernate:hibernate-validator
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

3-extensions/protocol/dubbo-samples-rest/pom.xml

@@ -34,7 +34,7 @@
         <spring.version>4.3.29.RELEASE</spring.version>
         <dubbo.version>3.0.7</dubbo.version>
         <validation-api.version>1.1.0.Final</validation-api.version>
-        <hibernate-validator.version>4.2.0.Final</hibernate-validator.version>
+        <hibernate-validator.version>6.0.23.Final</hibernate-validator.version>
         <swagger.version>1.5.19</swagger.version>
         <tomcat.version>8.0.53</tomcat.version>
         <spring-boot.version>1.5.13.RELEASE</spring-boot.version>