Update coverage to 7.6.3

[pyup-bot]

This PR updates coverage from 7.6.2 to 7.6.3.

Changelog

7.6.3

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

- Fix: nested context managers could incorrectly be analyzed to flag a missing
branch on the last context manager, as described in `issue 1876`_.  This is
now fixed.

- Fix: the missing branch message about not exiting a module had an extra
"didn't," as described in `issue 1873`_.  This is now fixed.

.. _issue 1873: https://github.com/nedbat/coveragepy/issues/1873
.. _issue 1876: https://github.com/nedbat/coveragepy/issues/1876


.. _changes_7-6-2:

Links

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