Use of native gen_random_uuid() since PG 13

[fljdin]

Hi!

As documented, the uuid-ossp extension is required and (as far I looked up) there are a few test files using dedicated uuid_generate_v4() method.

Since PostgreSQL v13, a native method has been added gen_random_uuid() and could be used in place to reduce dependancies.
What do you think about?

Regards, Florent

[pyramation]

thanks @fljdin !!

Actually, realizing the tests were just ast deparsing, the lib wasn't even necessary! thanks! it's been removed d652b31

Let me know if I missed anything, cheers!