Update coverage to 7.8.1

[pyup-bot]

This PR updates coverage from 7.8.0 to 7.8.1.

Changelog

7.8.1

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

- A number of EncodingWarnings were fixed that could appear if you've enabled
PYTHONWARNDEFAULTENCODING, fixing `issue 1966`_.  Thanks, `Henry Schreiner
<pull 1967_>`_.

- Fixed a race condition when using sys.monitoring with free-threading Python,
closing `issue 1970`_.

.. _issue 1966: https://github.com/nedbat/coveragepy/issues/1966
.. _pull 1967: https://github.com/nedbat/coveragepy/pull/1967
.. _issue 1970: https://github.com/nedbat/coveragepy/issues/1970

.. _changes_7-8-0:

Links

• PyPI: https://pypi.org/project/coverage
• Changelog: https://data.safetycli.com/changelogs/coverage/
• Repo: https://github.com/nedbat/coveragepy