Update tox to 3.25.1

[pyup-bot]

This PR updates tox from 3.25.0 to 3.25.1.

Changelog

3.25.1

--------------------

Bugfixes
^^^^^^^^

- ``sitepackages = true`` will add user's site-package to the python path on Windows as expected -- by :user:`niander`
`2402 <https://github.com/tox-dev/tox/issues/2402>`_
- Avoid importing ``pipes`` on Python 3.3+ to avoid ``DeprecationWarning`` on Python 3.11 -- by :user:`adamchainz`
`2417 <https://github.com/tox-dev/tox/issues/2417>`_
- Fix ``isolated_build`` when the build process produces stderr at exit.
`2449 <https://github.com/tox-dev/tox/issues/2449>`_


Documentation
^^^^^^^^^^^^^

- Explain advantages of ``PIP_CONSTRAINT`` environment variable over ``--constraint`` argument.
`2423 <https://github.com/tox-dev/tox/issues/2423>`_

Links

• PyPI: https://pypi.org/project/tox
• Changelog: https://pyup.io/changelogs/tox/
• Docs: https://tox.readthedocs.io

[codecov[bot]]

Codecov Report

Merging #747 (c9c5629) into master (b5ee383) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #747   +/-   ##
=======================================
  Coverage   90.47%   90.47%           
=======================================
  Files           6        6           
  Lines         294      294           
=======================================
  Hits          266      266           
  Misses         28       28           

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[pyup-bot]

Closing this in favor of #765