Bump mpi4py/setup-mpi from 1.2.7 to 1.2.8

Bumps [mpi4py/setup-mpi](https://github.com/mpi4py/setup-mpi) from 1.2.7 to 1.2.8.
- [Release notes](https://github.com/mpi4py/setup-mpi/releases)
- [Commits](mpi4py/setup-mpi@v1.2.7...v1.2.8)

---
updated-dependencies:
- dependency-name: mpi4py/setup-mpi
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/windows.yml

@@ -104,7 +104,7 @@ jobs:
           (Get-Content __init__.py).Replace('# WINDOWSDLL', 'import os; os.add_dll_directory("D:/a/dolfinx/dolfinx-install/bin"); os.add_dll_directory("C:/Program Files (x86)/Intel/oneAPI/mpi/2021.12/opt/mpi/libfabric/bin")') | Set-Content __init__.py
           Get-Content __init__.py
 
-      - uses: mpi4py/[email protected].7
+      - uses: mpi4py/[email protected].8
         with:
           mpi: "intelmpi"