Address conda build deprecations

[mbargull]

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)
• [ ] 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.

Stop using conda_build.conda_interface

conda_build.conda_interface is being deprecated.

conda_build.conda_interface.get_index (which is conda.exports.get_index) is using the conda.models.Dist -> conda.models.records.PackageRecord mapping. Dist class is legacy code that's being phased out, so avoid it.

[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.