WIP: Test Intel MPI 2021.16.1

Author: dalcinl

.github/workflows/impi.yml

@@ -54,7 +54,7 @@ jobs:
       if:   ${{ runner.os == 'Linux' || runner.os == 'macOS' }}
 
     - name: Install MPI
-      uses: mpi4py/setup-mpi@v1
+      uses: mpi4py/setup-mpi@ae4b2ac26d4e0b44c71c1e6d515ed244225f9cb4
       with:
         mpi: impi