sphinxcontrib-apidoc has runtime dependency on pbr

[tovrstra]

See sphinxcontrib-apidoc source code https://github.com/sphinx-contrib/apidoc/blob/master/sphinxcontrib/apidoc/__init__.py#L11

It would be nice to avoid the pbr runtime dependency, but I would not know how to get that done.

Checklist

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

[conda-forge-linter]

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.

[tovrstra]

@conda-forge-admin, please rerender

[tovrstra]

@CurtLH Can you take a look please? This PR should be ready for review. Thanks.

[tovrstra]

Thanks!