chore(deps): update mpi4py requirement from >=3.1.4 to >=4.1.2

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Updates the requirements on mpi4py to permit the latest version.

Release notes

Sourced from mpi4py's releases.

4.1.2

• Fix build issues from breaking changes in setuptools 81.

• Support Windows builds with Meson and Intel MPI.

• PyPy wheels are no longer published.

Full Changelog: mpi4py/mpi4py@4.1.1...4.1.2

Changelog

Sourced from mpi4py's changelog.

Release 4.1.2 [2026-05-16]

• Fix build issues from breaking changes in setuptools 81.

• Support Windows builds with Meson and Intel MPI.

• PyPy wheels are no longer published.

Release 4.1.1 [2025-10-10]

• Add MPIABI-aware import hook support.

• Support MPI.ERR_ERRHANDLER with Open MPI.

• Fix Windows build issues with Intel MPI 2021.16.

• Minor fixes and improvements to typing stubs.

• Minor fixes to documentation.

• Publish Python 3.8-3.14 and PyPy 3.11 wheels.

• PyPy 3.10 (EOL) wheels are no longer published.

Release 4.1.0 [2025-06-25]

• New features:

  • Publish binary wheel packages on PyPI_ with support for multiple operating systems (Linux, macOS, Windows), processor architectures (AMD64, ARM64), MPI implementations (MPICH, Open MPI, and their ABI-compatible derivatives), and Python implementations (CPython, PyPy).

    .. _PyPI: https://pypi.org/project/mpi4py/#files

  • Add support for the MPI 5.0 standard.

    • MPI handle serialization with integral values.
    • Fixed-size Fortran LOGICAL datatypes.
    • Query ABI version/info and Fortran ABI info.

  • MPI.Datatype.Create_contiguous now uses BigMPI_'s approach when using MPI implementations that do not yet support the MPI 4.0 large-count APIs.

... (truncated)

Commits

• 1c40e59 Bump version number to 4.1.2
• 5ad9820 chore: Update changelog
• c9cee66 chore: Update year to 2026
• f75876c GHA: Switch to actions/attest@v4
• 70fb888 GHA: Bump actions/checkout from 5 to 6
• 582c1dd GHA: Update use of actions/setup-python to skip upgrading pip
• a0d4854 CD: PyPy wheels are no longer published
• 7a260c8 CD: Use micromamba==2.5.0-2
• c77e8a2 test: Workaround MPICH 5.0.1 issues with MPI_LONG_DOUBLE
• 7abdae3 test: Skip long-double with MPICH 5.0 on macOS arm64
• Additional commits viewable in compare view

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