Python-debianbts

* Bump version to upload to Debian/Sid

* replaced pysimplesoap with hand-coded SOAP requests and parsing of replies
* replaced sphinx with mkdocs
* fixed some documentation issues
* Added Python 3.12 to test suite

* distribute typing information using py.typed
* replaced flake8 with ruff
* raised minimum python version to 3.8

* switched from setup.py to pyproject.toml
* modernized github actions
* added test for release

* removed support for positional arguments in `get_status`, `get_usertags` and
`get_bugs` (deprecated since 2.10.0 (2019-11))
* added type hints and mypy (strict) to test suite
* updated docstrings to use type hints
* removed obsolete code to fix issue with pysimplesoap with httplib2 for python
versions < 3.4
* removed support for ancient versions of pysimplesoap < 1.16.2
* updated github actions

* scrubbed obsolete constraints since debian/buster
* updated dev-requirements
* dropped python 3.6 support