Update pytest-cov to 6.0.0

[pyup-bot]

This PR updates pytest-cov from 4.1.0 to 6.0.0.

Changelog

6.0.0

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

* Updated various documentation inaccuracies, especially on subprocess handling.
* Changed fail under checks to use the precision set in the coverage configuration.
Now it will perform the check just like ``coverage report`` would.
* Added a ``--cov-precision`` cli option that can override the value set in your coverage configuration.
* Dropped support for now EOL Python 3.8.

5.0.0

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

* Removed support for xdist rsync (now deprecated).
Contributed by Matthias Reichenbach in `623 <https://github.com/pytest-dev/pytest-cov/pull/623>`_.
* Switched docs theme to Furo.
* Various legacy Python cleanup and CI improvements.
Contributed by Christian Clauss and Hugo van Kemenade in
`630 <https://github.com/pytest-dev/pytest-cov/pull/630>`_,
`631 <https://github.com/pytest-dev/pytest-cov/pull/631>`_,
`632 <https://github.com/pytest-dev/pytest-cov/pull/632>`_ and
`633 <https://github.com/pytest-dev/pytest-cov/pull/633>`_.
* Added a ``pyproject.toml`` example in the docs.
Contributed by Dawn James in `626 <https://github.com/pytest-dev/pytest-cov/pull/626>`_.
* Modernized project's pre-commit hooks to use ruff. Initial POC contributed by
Christian Clauss in `584 <https://github.com/pytest-dev/pytest-cov/pull/584>`_.

Links

• PyPI: https://pypi.org/project/pytest-cov
• Changelog: https://data.safetycli.com/changelogs/pytest-cov/
• Repo: https://github.com/pytest-dev/pytest-cov