### Change Summary

Ruff is now the sole linter 👍 
Files Altered: ['Makefile', 'docs/contributing.md', 'pyproject.toml', 'pdm.lock' ]

Notes: 

For pyproject.toml file,  I removed the last element('E501') of line 180 given black's removal but I'm not totally sure what this line is for. 

### Related Issue Number

Fix #7914

## Checklist

* [x] The pull request title is a good summary of the changes - it will be used in the changelog
* [ ] Unit tests for the changes exist
* [ ] Tests pass on CI
* [x] Documentation reflects the changes where applicable
* [x] My PR is ready to review, **please add a comment including the phrase "please review" to assign reviewers**

Adopting `ruff` formatter. ### Change Summary

Ruff is now the sole linter 👍 
Files Altered: ['Makefile', 'docs/contributing.md', 'pyproject.toml', 'pdm.lock' ]

Notes: 

For pyproject.toml file,  I removed the last element('E501') of line 180 given black's removal but I'm not totally sure what this line is for. 

### Related Issue Number

Fix #7914

## Checklist

* [x] The pull request title is a good summary of the changes - it will be used in the changelog
* [ ] Unit tests for the changes exist
* [ ] Tests pass on CI
* [x] Documentation reflects the changes where applicable
* [x] My PR is ready to review, **please add a comment including the phrase "please review" to assign reviewers**

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<a href="https://docs.pydantic.dev/2.0/blog/pydantic-v2-final/">Pydantic V2</a> is here 🚀! Upgrading an existing app? See the <a href="https://docs.pydantic.dev/2.0/migration/">Migration Guide</a> for tips on essential changes from Pydantic V1!

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