dbunit Merge Request #58: Use connection.unwrap to get PGConnection in PostgreSQLOidDataType.setSqlValue (merged)

I ran into a ClassCastException when using the oid datatype and the HikariCP connection pool. The getSqlValue already uses connection.unwrap, so I gave it a try in in a custom implementation of setSqlValue, and it worked. That's why I decided to use connection.unwrap in setSqlValue as well.

[Jeff Jensen]

Thank you for fixing this issue and creating an MR! Much appreciated.
Agreed, your fix parallels the getSqlValue() fix done a few years ago in commit c4d9b1f7.

Please let me know if you have interest in making more changes.