Fix: Update pyproject.toml Metadata

[Grochocinski]

Linked Issue (Required)

Fixes #209

The Fix

• Fixed the use of the deprecated license expression as outlined in the issue by replacing it with distinct license and license-files parameters. These options were added in setuptools v77.0.0, so the minimum version was bumped to support that. I don't believe there is a way around this bump if we still wish to include a license file (which we should absolutely include).
• Added additional classifiers to better convey the audience of the library and what Python versions are supported
• Added an "issues" label to the project URL section. See well-known labels for other labels we can add in the future (if applicable).

Verification

• ruff check passes on my code
• ty check passes on my code
• The bug is reproducible on the master branch.
• The bug is NO LONGER reproducible on this branch.
• All tests in the tests directory are passing.