Pin no longer needed for setuptools

[mikemhenry]

https://github.com/conda-forge/conda-forge-pinning-feedstock/issues/3973 is now resolved

Checklist

• [ ] Used a personal fork of the feedstock to propose changes
• [ ] Bumped the build number (if the version is unchanged)
• [ ] Reset the build number to 0 (if the version changed)
• [ ] Re-rendered with the latest conda-smithy (Use the phrase code>@<space/conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• [ ] Ensured the license file is being packaged.

[isuruf]

Thanks