Remove use of deprecated Mambaforge

Author: oleksandr-pavlyk

.github/workflows/build_pip.yaml

@@ -34,7 +34,6 @@ jobs:
       - uses: conda-incubator/setup-miniconda@v3
         with:
           use-mamba: true
-          miniforge-variant: Mambaforge
           miniforge-version: latest
           channels: conda-forge
           activate-environment: test