Use Miniforge3 variant, instead of deprecated Mambaforge

Author: oleksandr-pavlyk

.github/workflows/conda-package.yml

@@ -87,7 +87,7 @@ jobs:
 
       - uses: conda-incubator/setup-miniconda@v3
         with:
-          miniforge-variant: Mambaforge
+          miniforge-variant: Miniforge3
           miniforge-version: latest
           activate-environment: build
           channels: conda-forge