🐞 Fix calls to poetry from within nox tasks #403
Description
Issues #376 updated poetry version in the PTB to 2.1.2 which requires adding -- after poetry run if there are options to the command to be executed by poetry.
The current ticket requests adding -- after poetry run also for internal commands of the PTB, e.g. poetry run coverage in _test_command().
Maybe, we can even remove poetry run inside the _test() as the nox task has been called with poetry run anyway?