feat: pypi lowercase transforms

[beckermr]

Description:

PyPI now uses lowercase all the time, so let's add that to the url transforms we try.

Checklist:

• [x] Pydantic model updated or no update needed

Cross-refs, links to issues, etc:

[codecov[bot]]

Codecov Report

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

Project coverage is 77.51%. Comparing base (7a6bcd9) to head (50dcadb). Report is 5 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3148 +/- ## ======================================= Coverage 77.50% 77.51% ======================================= Files 124 124 Lines 13299 13301 +2 ======================================= + Hits 10308 10310 +2 Misses 2991 2991 ```

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