Revert "Temporarily pin `conda` to `4.1.x` on CI so that `conda-smithy` works."
Revert "Temporarily pin `conda` to `4.1.x` on CI so that `conda-smithy` works."

This reverts commit ec8aeb1c1bbcbd308b73861ade70c08e69a31458.

conda-forge/conda-forge-webservices,conda-forge/conda-forge-webservices