Update build.yml github actions

This PR removes mamba with conda-incubator/setup-miniconda@v3. This was causing broken CI workflows

.github/workflows/build.yml

@@ -66,26 +66,27 @@ jobs:
     - name: Configure conda
       uses: conda-incubator/setup-miniconda@v3
       with:
-        activate-environment: test
-        miniforge-variant: Mambaforge
+        auto-update-conda: true
+        channels: conda-forge
         python-version: ${{ matrix.python-version }}
-        use-mamba: true
+        # this is needed for caching to work properly:
+        use-only-tar-bz2: true
 
     - name: Conda info
       run: conda info --all
 
     - name: Install dependencies
       run: |
         # parse requirements to install as much as possible with conda
-        mamba create --name pip2conda pip2conda
-        mamba run -n pip2conda pip2conda \
+        conda create --name pip2conda pip2conda
+        conda run -n pip2conda pip2conda \
             --all \
             --output environment.txt \
             --python-version ${{ matrix.python-version }}
         echo "-----------------"
         cat environment.txt
         echo "-----------------"
-        mamba install --quiet --yes --name test --file environment.txt
+        conda install --quiet --yes --name test --file environment.txt
 
     - name: Install GWSumm
       run: python -m pip install . --no-build-isolation -vv