Errors when installing new dependencies

[Etesam913]

Overview

Adding a new dependency into requirements.txt causes errors to occur in the github actions workflow.

For example,
When I added the rich dependency to the requirements.txt file I got this output for the test:
https://github.com/facebookresearch/Mephisto/runs/7237323897?check_suite_focus=true

The issue is not exclusive to rich as I also got this error when trying to add the detoxify dependency.

[JackUrb]

For some context, we moved away from poetry due to python-poetry/poetry#34 causing issues with setup.py develop and other editable installs, which we needed to be able to do local development of tasks. This has been resolved as of Poetry 1.2, and as such the solution is to upgrade to there and then remove requirements.txt entirely and work from pyproject.toml instead. Will jump into this next week. In the meantime, feel free to skip the dependencies temporarily.

This is tied to #768