build(deps): bump hibernate-core in /samples/java/hibernate (#508)
build(deps): bump hibernate-core in /samples/java/hibernate (#508)

Bumps [hibernate-core](https://github.com/hibernate/hibernate-orm) from 5.2.13.Final to 5.3.20.Final.
- [Release notes](https://github.com/hibernate/hibernate-orm/releases)
- [Changelog](https://github.com/hibernate/hibernate-orm/blob/5.3.20/changelog.txt)
- [Commits](https://github.com/hibernate/hibernate-orm/compare/5.2.13...5.3.20)

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

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
GoogleCloudPlatform/pgadapter,GoogleCloudPlatform/pgadapter,GoogleCloudPlatform/pgadapter,GoogleCloudPlatform/pgadapter,GoogleCloudPlatform/pgadapter,GoogleCloudPlatform/pgadapter,GoogleCloudPlatform/pgadapter