ci: don't use mambaforge (#741)

Author: gadomski

.github/workflows/continuous-integration.yml

@@ -80,7 +80,6 @@ jobs:
       - name: Setup Conda Environment
         uses: conda-incubator/setup-miniconda@v3.0.4
         with:
-          miniforge-variant: Mambaforge
           miniforge-version: latest
           python-version: "3.10"
           use-mamba: true