Modernize pyproject + tox

[kingbuzzman]

No description provided.

[Copilot]

Pull Request Overview

This PR modernizes the project's packaging configuration by replacing PEP 735 dependency groups with the more widely supported optional dependencies format. The changes update both the pyproject.toml configuration and the tox.ini file to use the standardized extras syntax instead of the newer dependency-groups feature.

• Converts [dependency-groups] to [project.optional-dependencies] in pyproject.toml
• Updates tox.ini to use extras instead of dependency_groups for all test environments

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
pyproject.toml	Migrates from dependency-groups to optional-dependencies format
tox.ini	Updates all testenv configurations to use extras instead of dependency_groups

Comments suppressed due to low confidence (1)

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[webknjaz]

@kingbuzzman why did you say "modernize" in the title but the diff shows the opposite? It's rather wrong to expose public API for dev-related deps. Do you expect the users to do pip install 'pytest-django [docs]'?

[kingbuzzman]

@webknjaz -- I completely misunderstood PEP735 -- I'll revert it as soon as codecov + readthedocs get their act together.