Update hibernate core to v5.6.15.Final

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.hibernate:hibernate-ehcache (source)	5.6.10.Final -> 5.6.15.Final
org.hibernate:hibernate-core (source)	5.6.10.Final -> 5.6.15.Final

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Release Notes

hibernate/hibernate-orm (org.hibernate:hibernate-ehcache)

### [`v5.6.15.Final`](https://togithub.com/hibernate/hibernate-orm/compare/5.6.14...5.6.15) [Compare Source](https://togithub.com/hibernate/hibernate-orm/compare/5.6.14...5.6.15) ### [`v5.6.14.Final`](https://togithub.com/hibernate/hibernate-orm/compare/5.6.13...5.6.14) [Compare Source](https://togithub.com/hibernate/hibernate-orm/compare/5.6.13...5.6.14) ### [`v5.6.13.Final`](https://togithub.com/hibernate/hibernate-orm/compare/5.6.12...5.6.13) [Compare Source](https://togithub.com/hibernate/hibernate-orm/compare/5.6.12...5.6.13) ### [`v5.6.12.Final`](https://togithub.com/hibernate/hibernate-orm/compare/5.6.11...5.6.12) [Compare Source](https://togithub.com/hibernate/hibernate-orm/compare/5.6.11...5.6.12) ### [`v5.6.11.Final`](https://togithub.com/hibernate/hibernate-orm/compare/5.6.10...5.6.11) [Compare Source](https://togithub.com/hibernate/hibernate-orm/compare/5.6.10...5.6.11)

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