Django-minio-backend

Fixes bug introduced in issue/34

Due to a bug all public bucket urls were generated using the internal client. Due to this fault public urls did not respect the value of `MINIO_EXTERNAL_ENDPOINT`.
The old fake client was repurposed as an external client.

Additional changes:
* Dropped the `v` prefix from version numbers
* GH workflows updated to the latest Ubuntu and Python versions and updated the watched tags
* [README.md](README.md) updated with new Python version recommendations

What's Changed
* Make django-mini-backend Region aware by subho007 in https://github.com/theriverman/django-minio-backend/pull/39

New Contributors
* subho007 made their first contribution in https://github.com/theriverman/django-minio-backend/pull/39

**Full Changelog**: https://github.com/theriverman/django-minio-backend/compare/v3.3.2...v3.4.0

**Full Changelog**: https://github.com/theriverman/django-minio-backend/compare/v3.3.1...v3.3.2

Released in relation to 29
It's no longer required to define both a public and a private bucket