Bump hibernate.version from 5.6.14.Final to 5.6.15.Final in /core (closes #519)

Bumps `hibernate.version` from 5.6.14.Final to 5.6.15.Final.

Updates `hibernate-ehcache` from 5.6.14.Final to 5.6.15.Final
- [Release notes](https://github.com/hibernate/hibernate-orm/releases)
- [Changelog](https://github.com/hibernate/hibernate-orm/blob/5.6.15/changelog.txt)
- [Commits](https://github.com/hibernate/hibernate-orm/compare/5.6.14...5.6.15)

Updates `hibernate-jpamodelgen` from 5.6.14.Final to 5.6.15.Final
- [Release notes](https://github.com/hibernate/hibernate-orm/releases)
- [Changelog](https://github.com/hibernate/hibernate-orm/blob/5.6.15/changelog.txt)
- [Commits](https://github.com/hibernate/hibernate-orm/compare/5.6.14...5.6.15)

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

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

Change-Id: I8efeb30b5af95b8153d8e70e3f3ecfbe5a6d5f51
diff --git a/core/pom.xml b/core/pom.xml
index ff02e3f..e1cb4a2 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -11,7 +11,7 @@
 		<spring.version>5.3.25</spring.version>
 		<jersey.version>2.37</jersey.version>
 		<jetty.version>9.4.50.v20221201</jetty.version>
-		<hibernate.version>5.6.14.Final</hibernate.version>
+		<hibernate.version>5.6.15.Final</hibernate.version>
 		<flyway.version>9.14.1</flyway.version>
 		<log4j.version>2.19.0</log4j.version>
 		<krill.version>[0.61,)</krill.version>