Modernize pyproject.toml to work with uv

[hunse]

Motivation and context:

This is required to be able to do uv pip install -e . and create an editable install.

It modernizes the pyproject.toml file according to the following primer:
See https://packaging.python.org/en/latest/guides/modernize-setup-py-project/#modernize-setup-py-project

NOTE: This is a "minimal" modernization to make us standards-compliant and get things working with uv. Moving all non-programmatic metadata (e.g. project name, author, etc.) from setup.py to pyproject.toml is recommended, and we could pursue this at some point.

How has this been tested?

Installed it locally and it works.

How long should this take to review?

• Quick (less than 40 lines changed or changes are straightforward)

Types of changes:

• New feature (non-breaking change which adds functionality)

Checklist:

• I have read the CONTRIBUTING.rst document.
• I have updated the documentation accordingly.
• I have included a changelog entry.
• I have added tests to cover my changes.
• I have run the test suite locally and all tests passed.

Still to do:

[github-actions]

Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
nengo_bones
version.py
Project Total

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