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I see in one of the branches, you're doing this:

Which is using a constraints file to install just black, without having to manually specify its version inside of the session.

I tried doing something similar here, but I get the following problem:

# constraints.txt
black==21.1.0

❯ pip --version
pip 23.1.2

❯ pip install -c constraints.txt black
ERROR: Cannot install black because these package versions have conflicting dependencies.

The conflict is caused by:
    The user requested black
    The user requested (constraint) black==21.1.0

To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip attempt to solve the dependency conflict

ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/topics/dependency-resolution/#dealing-with-dependency-conflicts