[MNT]: Essential build requirements not included in dev-requirements

[flaviut]

Summary

Following the instructions on the dev setup page fails due to these missing dependencies:

$ python -m pip install --verbose --no-build-isolation --editable ".[dev]"
Using pip 24.0 from /home/user/dev/matplotlib/venv/lib/python3.12/site-packages/pip (python 3.12)
Obtaining file:///home/user/dev/matplotlib
  Running command Checking if build backend supports build_editable
  Checking if build backend supports build_editable ... done
...
ModuleNotFoundError: No module named 'mesonpy'

It seems like the CI tasks need to manually install them as well:

matplotlib/azure-pipelines.yml

Line 138 in a4243d9

python -m pip install --upgrade meson-python numpy pybind11 setuptools-scm

and once they are manually installed locally using python -m pip install meson-python numpy pybind11 setuptools-scm, the build succeeds:

$ python -m pip install --verbose --no-build-isolation --editable ".[dev]"
...
Installing collected packages: matplotlib
  Attempting uninstall: matplotlib
    Found existing installation: matplotlib 3.8.4
    Uninstalling matplotlib-3.8.4:
      Removing file or directory /home/user/dev/matplotlib/venv/lib/python3.12/site-packages/__pycache__/pylab.cpython-312.pyc
      Removing file or directory /home/user/dev/matplotlib/venv/lib/python3.12/site-packages/matplotlib-3.8.4.dist-info/
      Removing file or directory /home/user/dev/matplotlib/venv/lib/python3.12/site-packages/matplotlib/
      Removing file or directory /home/user/dev/matplotlib/venv/lib/python3.12/site-packages/mpl_toolkits/axes_grid1/
      Removing file or directory /home/user/dev/matplotlib/venv/lib/python3.12/site-packages/mpl_toolkits/axisartist/
      Removing file or directory /home/user/dev/matplotlib/venv/lib/python3.12/site-packages/mpl_toolkits/mplot3d/
      Removing file or directory /home/user/dev/matplotlib/venv/lib/python3.12/site-packages/pylab.py
      Successfully uninstalled matplotlib-3.8.4
Successfully installed matplotlib-3.10.0.dev168+ga4243d9557

Proposed fix

Update the requirements files to include these dependencies. Update the pipelines to only use the requirements files and not manual pip calls.