Targetcli

* Drop the _fb suffix from rtslib and configshell module names
* Use portal ::0 instead of 0.0.0.0 to listen on both IPv6 and IPv4

What's Changed

Python 3.9 is now the minimal required version. The PyPI releases can be found at https://pypi.org/project/targetcli/

* Refactor the project for Python>=3.9, PEP-517, PEP-621; Add linting, pre-commit.
* Add workflows for pre-commit and PyPI release by martinhoyer in https://github.com/open-iscsi/targetcli-fb/pull/205

Bugfix release