Bump hibernate.version from 5.6.7.Final to 5.6.8.Final (#3199)

Bumps `hibernate.version` from 5.6.7.Final to 5.6.8.Final.

Updates `hibernate-core` from 5.6.7.Final to 5.6.8.Final
- [Release notes](https://github.com/hibernate/hibernate-orm/releases)
- [Changelog](https://github.com/hibernate/hibernate-orm/blob/5.6.8/changelog.txt)
- [Commits](hibernate/hibernate-orm@5.6.7...5.6.8)

Updates `hibernate-entitymanager` from 5.6.7.Final to 5.6.8.Final
- [Release notes](https://github.com/hibernate/hibernate-orm/releases)
- [Changelog](https://github.com/hibernate/hibernate-orm/blob/5.6.8/changelog.txt)
- [Commits](hibernate/hibernate-orm@5.6.7...5.6.8)

---
updated-dependencies:
- dependency-name: org.hibernate:hibernate-core
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.hibernate:hibernate-entitymanager
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pom.xml

@@ -73,7 +73,7 @@
         <jaxb.impl.version>2.3.5</jaxb.impl.version>
         <activation.api.version>1.2.2</activation.api.version>
         <slf4j.version>1.7.36</slf4j.version>
-        <hibernate.version>5.6.7.Final</hibernate.version>
+        <hibernate.version>5.6.8.Final</hibernate.version>
         <jackson2.version>2.13.2</jackson2.version>
         <jackson2.databind.version>2.13.2.2</jackson2.databind.version>
         <lucene.version>4.6.0</lucene.version>