OGM-404 BuiltInTypeTest sometimes fails because of the TimeZone

https://hibernate.atlassian.net/browse/OGM-404

Only the commit https://github.com/DavideD/hibernate-ogm/commit/582e364a0822a39f59ba3a39757c23fa1cfdd2b5 is required to solve this issue but I was wondering if it is correct to set the TimeZone instead of using the default one before converting the dates.

In the end I've decided to use the default TimeZone before converting the dates but if there are good reason to use the UTC then feel free to remove the https://github.com/DavideD/hibernate-ogm/commit/5bba1d7e96855bae7cabd30c38acdee6e030adbc commit