MAINT: use conda for linters

[tupui]

Small PR to not use pip to install linters. Seems like both Ruff and cython-lint are now available on conda-forge.

[rgommers]

LGTM and resolves fine, so in it goes. Thanks @tupui

[tupui]

CI failure on main is related to this.

Maybe there is a caching issue with the conda index. Locally it resolves, but I have a M1 so not totally equivalent, but still.

conda-forge/osx-64                                          Using cache
conda-forge/noarch                                          Using cache

Looking for: ['python', "setuptools[version='<60.0']", 'cython', 'compilers', "meson[version='>=0.64.0']", 'meson-python', 'ninja', 'numpy', 'openblas', 'pkg-config', 'libblas=[build=*openblas]', 'pybind11', 'pooch', "pythran[version='>=0.11.0']", 'pytest', 'pytest-cov', 'pytest-xdist', 'pytest-timeout', "asv[version='<0.5']", 'mypy', 'typing_extensions', 'sphinx', 'numpydoc', 'ipython', 'matplotlib', 'pydata-sphinx-theme==0.9.0', 'sphinx-design', 'mpmath', 'gmpy2', 'threadpoolctl', 'rich-click', 'click', "doit[version='>=0.36.0']", 'pydevtool', 'ruff', 'cython-lint']

Could not solve for environment specs
Encountered problems while solving:
  - nothing provides requested ruff
  - nothing provides requested cython-lint