Remove unused MPI installation

Author: martin-s-a

.github/workflows/release.yml

@@ -13,9 +13,6 @@ jobs:
     - name: Checkout
       uses: actions/checkout@main
 
-    - name: Set up MPI
-      uses: mpi4py/setup-mpi@master
-
     - name: Set up Python
       uses: actions/setup-python@main
       with: