chore(deps): bump tox from 4.21.0 to 4.21.1

[dependabot[bot]]

Bumps tox from 4.21.0 to 4.21.1.

Release notes

Sourced from tox's releases.

4.21.1

What's Changed

• Fix TOML configuration errors by @​gaborbernat in tox-dev/tox#3388

Full Changelog: https://github.com/tox-dev/tox/compare/4.21.0...4.21.1

Changelog

Sourced from tox's changelog.

v4.21.1 (2024-10-02)

Bugfixes - 4.21.1

- Fix error when using ``requires`` within a TOML configuration file - by :user:`gaborbernat`. (:issue:`3386`)
- Fix error when using ``deps`` within a TOML configuration file - by :user:`gaborbernat`. (:issue:`3387`)
- Multiple fixes for the TOML configuration by :user:`gaborbernat`.:

Do not fail when there is an empty command within commands.
Allow references for set_env by accepting list of dictionaries for it.
Do not try to be smart about reference unrolling, instead allow the user to control it via the extend flag,

available both for posargs and ref replacements.
The ref replacements raw key has been renamed to of. (:issue:3388)

Commits

• 434ac18 release 4.21.1
• 34d3adc Fix TOML configuration errors (#3388)
• 719b346 Update installation.rst
• See full diff in compare view

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