Release new conda-pypi

[danyeaw]

With repodata v3 supported in tests with #247, we should do another small conda-pypi release. This will ensure that users have conda-rattler-solver >= 0.0.6 installed. This is a breaking change, so we also need to coordinate merging conda-incubator/conda-pypi-test#19 and notifying our alpha testers to update conda-pypi in their base environment to continue testing.