Use Miniforge instead of Mambaforge (#31)

Author: mdpiper

.github/workflows/test.yml

@@ -29,7 +29,6 @@ jobs:
 
       - uses: conda-incubator/setup-miniconda@v3
         with:
-          miniforge-variant: Mambaforge
           miniforge-version: latest
           python-version: ${{ matrix.python-version }}