Bump mpi4py from 3.1.6 to 4.0.0

Bumps [mpi4py](https://github.com/mpi4py/mpi4py) from 3.1.6 to 4.0.0.
- [Release notes](https://github.com/mpi4py/mpi4py/releases)
- [Changelog](https://github.com/mpi4py/mpi4py/blob/master/CHANGES.rst)
- [Commits](mpi4py/mpi4py@3.1.6...4.0.0)

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

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

requirements.txt

@@ -17,7 +17,7 @@ langchain-openai==0.1.19
 lxml==5.2.2 
 matplotlib==3.9.1
 mkl==2023.2.0
-mpi4py==3.1.6
+mpi4py==4.0.0
 pyauthenticator==0.2.0
 pygraphviz==1.13
 pyiron==0.5.2