Bump mpi4py from 4.0.2 to 4.0.3

Bumps [mpi4py](https://github.com/mpi4py/mpi4py) from 4.0.2 to 4.0.3.
- [Release notes](https://github.com/mpi4py/mpi4py/releases)
- [Changelog](https://github.com/mpi4py/mpi4py/blob/master/CHANGES.rst)
- [Commits](mpi4py/mpi4py@4.0.2...4.0.3)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -1,4 +1,4 @@
 imageio==2.37.0
-mpi4py==4.0.2
+mpi4py==4.0.3
 numpy==2.2.2
 pillow==11.1.0