chore(project): move black to dev-dependencies

[Temidayo32]

Because

• black is a development tool and should not be part of production dependencies

This commit

• moves black from dependencies to dev-dependencies in the poetry configuration

Fixes #315

[Temidayo32]

Thanks for the merge!

[b4handjr]

I had to revert this, something was wrong on my end and it merged with an incorrect title. Can you open a new one? Thanks

[Temidayo32]

Alright. I will do that right away!