Remove setuptools from runtime dependencies

[matteobachetti]

Having it as a runtime dependency is not needed, and it's breaking the hendrics feedstock. See here: https://github.com/conda-forge/hendrics-feedstock/pull/19

[codecov[bot]]

Codecov Report

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

Project coverage is 96.11%. Comparing base (aee67bb) to head (9729b7d). Report is 8 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #852 +/- ## ======================================= Coverage 96.11% 96.11% ======================================= Files 48 48 Lines 9371 9371 ======================================= Hits 9007 9007 Misses 364 364 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.