packaging: Remove requirements/ folder. Unused.

[tony]

Changes

Packaging

• Remove requirements/ folder, which has been deprecated by pyproject.toml

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (1df4c82) 88.84% compared to head (5ba4229) 88.84%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #507 +/- ## ======================================= Coverage 88.84% 88.84% ======================================= Files 35 35 Lines 3514 3514 Branches 484 484 ======================================= Hits 3122 3122 Misses 284 284 Partials 108 108 ```

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