Update coverage to 7.3.0

[pyup-bot]

This PR updates coverage from 7.2.7 to 7.3.0.

Changelog

7.3.0

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

- Added a :meth:`.Coverage.collect` context manager to start and stop coverage
data collection.

- Dropped support for Python 3.7.

- Fix: in unusual circumstances, SQLite cannot be set to asynchronous mode.
Coverage.py would fail with the error ``Safety level may not be changed
inside a transaction.`` This is now avoided, closing `issue 1646`_.  Thanks
to Michael Bell for the detailed bug report.

- Docs: examples of configuration files now include separate examples for the
different syntaxes: .coveragerc, pyproject.toml, setup.cfg, and tox.ini.

- Fix: added ``nosemgrep`` comments to our JavaScript code so that
semgrep-based SAST security checks won't raise false alarms about security
problems that aren't problems.

- Added a CITATION.cff file, thanks to `Ken Schackart <pull 1641_>`_.

.. _pull 1641: https://github.com/nedbat/coveragepy/pull/1641
.. _issue 1646: https://github.com/nedbat/coveragepy/issues/1646


.. _changes_7-2-7:

Links

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