Replace dependency org.hibernate:hibernate-core with org.hibernate.orm:hibernate-core (main)

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This PR contains the following updates:

Package	Type	Update	Change
org.hibernate:hibernate-core (source)	compile	replacement	5.2.11.Final -> 6.6.13.Final

By merging this PR, the issue #159 will be automatically resolved and closed:

Severity	CVSS Score	CVE	Reachability
High	7.4	CVE-2020-25638
Medium	6.5	CVE-2019-14900

This is a special PR that replaces org.hibernate:hibernate-core with the community suggested minimal stable replacement version.

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