Numba-mpi

What's Changed
* Simplify readme plot code by Delcior in https://github.com/numba-mpi/numba-mpi/pull/132
* Create CODE_OF_CONDUCT.md by slayoo in https://github.com/numba-mpi/numba-mpi/pull/128
* polishing benchmark example description text by slayoo in https://github.com/numba-mpi/numba-mpi/pull/133
* require Python>=3.8 in setup.py. closes 134 by slayoo in https://github.com/numba-mpi/numba-mpi/pull/135 (thanks DManowitz for reporting!)

**Full Changelog**: https://github.com/numba-mpi/numba-mpi/compare/v0.41...v0.42

What's Changed
* switch from macos-latest to macos-12 (as the former is now only available for arm64) by slayoo in https://github.com/numba-mpi/numba-mpi/pull/126
* sample benchmark script numba_mpi vs mpi4py+numba by Delcior in https://github.com/numba-mpi/numba-mpi/pull/127
* Readme updates by slayoo in https://github.com/numba-mpi/numba-mpi/pull/130


**Full Changelog**: https://github.com/numba-mpi/numba-mpi/compare/v0.40...v0.41

What's Changed
* add Python 3.12 support (and drop Python 3.7 support)

**Full Changelog**: https://github.com/numba-mpi/numba-mpi/compare/v0.39...v0.40

- remove NumPy<=1.24.4 constraint (test fixed not to cause deprecation warnings) (https://github.com/numba-mpi/numba-mpi/pull/114)

- loading the very same MPI library as mpi4py does (thanks SouradeepPal for reporting that previous logic failed with multiple MPI libraries installed)

- introduce numpy<=1.24.4 requirement till we sort out the failures with the newest releases