chore(release): 6.4.0 [skip ci]

# [6.4.0](https://gitlab.com/to-be-continuous/python/compare/6.3.5...6.4.0) (2023-11-02)

### Features

* add vault variant ([bf678c4d](https://gitlab.com/to-be-continuous/python/commit/bf678c4d300c77f3805b016f9a74a29b4c520af5))