Raise version to 3.1.0 and adapt dependencies to upstream setup.cfg

[timostrunk]

Checklist

• [x] Used a personal fork of the feedstock to propose changes
• [x] Bumped the build number (if the version is unchanged)
• [x] Reset the build number to 0 (if the version changed)
• [x] 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)
• [x] Ensured the license file is being packaged.

The conda-forge bot did not send an update to 3.1.0. The hypothesis is that the download URL is incorrect. I fixed the download URL and adapted the requirements to the upstream setup.cfg (I sorted them in the same order for easier checking).

[conda-forge-webservices[bot]]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[timostrunk]

@conda-forge-admin, please rerender

[timostrunk]

Will investigate the build errors

[timostrunk]

Build errors gone, ready for review