CI: Fix the name of the 'build' package to 'python-build' on conda-forge

[seisman]

Description of proposed changes

Our Docs workflow suddenly failed (https://github.com/GenericMappingTools/pygmt/actions/runs/10502290769/job/29093673041) with following errors:

  error    libmamba Could not solve for environment specs
      The following package could not be installed
      └─ build does not exist (perhaps a typo or a missing channel).
  critical libmamba Could not solve for environment specs

It turns out the build package has the name build on PyPI (https://pypi.org/project/build/), but has the name python-build on conda-forge (https://anaconda.org/conda-forge/python-build).

The build package also exists on conda-forge (https://anaconda.org/conda-forge/build) but it's no longer maintained and has a very old version (v0.7.0). Xref: conda-forge/build-feedstock#2

Aslo xref: https://conda-forge.org/news/2024/08/21/remove-build/

[seisman]

As maintainers, you'd better to run the following commands to refresh your local pygmt dev environment:

mamba uninstall build    # Uninstall build v0.7.0
mamba install python-build  # Install the latest version

[weiji14]

Maybe ok to remove the comment here?

[seisman]

Removed.