CI is broken due to MPI install issue

[sfc-gh-mvashishtha]

https://github.com/modin-project/modin/actions/runs/15893469893/job/44863979178

[sfc-gh-mvashishtha]

It seems that the breakage started when mpi4py 4.1 came out on pypi. For now we will cap mpi4py at <4.1