chore(deps-dev): Bump tox from 4.20.0 to 4.21.0

[dependabot[bot]]

Bumps tox from 4.20.0 to 4.21.0.

Changelog

Sourced from tox's changelog.

v4.21.0 (2024-09-30)

Features - 4.21.0

- Native TOML configuration support - by :user:`gaborbernat`. (:issue:`999`)
Improved Documentation - 4.21.0

• Update Loader docs - by :user:ziima (:issue:3352)

Commits

• 46bef9e release 4.21.0
• cea105b True TOML config support (#3353)
• a04b039 [pre-commit.ci] pre-commit autoupdate (#3385)
• f5eba31 Update Loader docs (#3352)
• 329db63 [pre-commit.ci] pre-commit autoupdate (#3350)
• f4b3bd2 Bump pypa/gh-action-pypi-publish from 1.10.1 to 1.10.2 (#3349)
• See full diff in compare view

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (4427fe5) to head (30de108). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #466 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 24 24 Lines 4124 4124 ========================================= Hits 4124 4124 ```

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