chore: update dev instructions to include nox -s format

[ohmayr]

Update instructions so that users are running nox -s format instead of the deprecated nox -s blacken for formatting code.

[gemini-code-assist]

Summary of Changes

Hello @ohmayr, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the development instructions to ensure that developers are using the correct and up-to-date command for code formatting. This change replaces a deprecated command with its current equivalent, streamlining the development workflow and maintaining consistency in code style.

Highlights

• Development Instructions: The documentation for code formatting has been updated to reflect the current command. The old nox -s blacken command has been replaced with nox -s format.

Changelog

• DEVELOPMENT.md
  • Updated the code formatting command from nox -s blacken to nox -s format under the 'Formatting' section.

Activity

• The pull request was created by ohmayr.

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[gemini-code-assist]

Code Review

This pull request correctly updates the development instructions to use nox -s format instead of the deprecated nox -s blacken. I've suggested a small wording improvement to make the instructions clearer about the purpose of the command.