Remove --sdist --wheel flags from the build command

[seisman]

Description of proposed changes

Simply use python -m build without any flags following the official recommendations (https://pypa-build.readthedocs.io/en/stable/index.html).

Please note that both python -m build and python -m build --sdist --wheel can build source and binary distributions but the details are different:

By default, a source distribution (sdist) is built from {srcdir} and a binary distribution (wheel) is built from the sdist. This is recommended as it will ensure the sdist can be used to build wheels. Pass -s/–sdist and/or -w/–wheel to build a specific distribution. If you do this, the default behavior will be disabled, and all artifacts will be built from {srcdir} (even if you combine -w/–wheel with -s/–sdist, the wheel will be built from {srcdir}).

[weiji14]

Seems like a minor difference, but best to check on TestPyPI after merging this PR to see what the sdist and bdist has changed. Hopefully the file size gets smaller 🙂

[seisman]

Seems like a minor difference, but best to check on TestPyPI after merging this PR to see what the sdist and bdist has changed. Hopefully the file size gets smaller 🙂

No changes on file sizes 🙂 (Compare https://test.pypi.org/project/pygmt/0.8.1.dev98/#files and https://test.pypi.org/project/pygmt/0.8.1.dev99/#files).