Constrain conda version to fix OSX virtual packages
This MR fixes the broken osx builds by using a conda version that doesn't have a broken implementation of the __osx
virtual package, see https://github.com/conda/conda/issues/12219.
This MR fixes the broken osx builds by using a conda version that doesn't have a broken implementation of the __osx
virtual package, see https://github.com/conda/conda/issues/12219.