Fix inclusion of libcint .so files in package_data via pyproject.toml

[msricher]

Previously, when running pip install on gbasis, the libcint files were not included with the distribution or in the installation. This fixed pyproject.toml so that libcint files are included with the installation now.

Checklist

• Write a good description of what the PR does.
• Add tests for each unit of code added (e.g. function, class)
• Update documentation
• Squash commits that can be grouped together
• Rebase onto master

Type of Changes

	Type
✓	🐛 Bug fix
✓	✨ New feature
✓	🔨 Refactoring
✓	📜 Docs

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