Fix superlu_dist version and build

.github/workflows/ci-fenics.yml

@@ -18,22 +18,25 @@ jobs:
 
       - name: Setup Miniconda
         uses: conda-incubator/setup-miniconda@v2
-        with: 
+        with:
           auto-update-conda: true
           python-version: 3.8
+          mamba-version: "*"
+          channels: conda-forge,defaults
+          channel-priority: true
 
       - name: Conda info
         shell: bash -l {0}
         run: |
           conda info
           which python
 
-      - name: Conda install FEniCS
+      - name: Mamba install FEniCS
         shell: bash -l {0}
         run: |
           conda config --set always_yes yes
           conda config --add channels conda-forge
-          conda create -n fenicsproject -c conda-forge fenics
+          mamba create -n fenicsproject -c conda-forge fenics superlu_dist=6.2.0=h050a5a1_4
           conda activate fenicsproject
           which python
           python -c "from dolfin import *"