ci: exclude rank=9 for openmpi as it does not run in CI (works locally)

Author: mrava87

.github/workflows/build.yml

@@ -20,6 +20,8 @@ jobs:
         exclude:
           - os: macos-latest
             mpi: 'intelmpi'
+          - mpi: 'openmpi'
+            rank: '9' # works locally, not in CI
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout