uuid7 package seems to be not up to date with UUIDv7 draft

[BenediktBurger]

According to stevesimmons/uuid7#1 the currently used uuid7 implementation is broken.

I added test, it does not work as the most recent draft requires it to work:
https://datatracker.ietf.org/doc/draft-ietf-uuidrev-rfc4122bis/14/

[BenediktBurger]

This repo seems to implement the most recent draft: https://github.com/oittaa/uuid6-python

Here is the link to the standard library issue about adding uuidv7 : python/cpython#102461

[BenediktBurger]

The uuid6 package is already on conda-forge, which makes it easier for #31