removed redundant mpi setup

.github/workflows/python-test.yml

@@ -9,6 +9,8 @@ jobs:
             - uses: actions/checkout@v3
             - name: Set up MPI
               uses: mpi4py/setup-mpi@v1
+              with:
+                mpi: 'openmpi'
             - name: Set up Python
               uses: actions/setup-python@v4
               with:
@@ -19,10 +21,6 @@ jobs:
                   pip install ruff pytest pytest-cov
                   pip install -r requirements.txt
                   pip install .
-            - name: Set up MPI
-              uses: mpi4py/setup-mpi@v1
-              with:
-                mpi: 'openmpi'
             - name: Lint with ruff
               run: |
                   # stop the build if there are Python syntax errors or undefined names