Version limitation on virtualenv

Hi and thanks for providing this very useful tool! I'd like to improve the packaging on Fedora Linux and with Fedora Rawhide (which will become version 42) I have an issue because it ships with virtualenv 20.28 which obviously doesn't fulfill the following requirement for running the tests: https://github.com/andreafrancia/trash-cli/blob/73e5892830aa93dfe3e837f84363ffac35a6003d/tox.ini#L2 I could disable testing of course, but having those as a quick "smoke test" to see if a new version is installed correctly is a good idea imo. Any information on why this upper version bound was introduced or whether it can be increased / lifted would be quite helpful for me. Thanks in advance :)