Update dependency coverage to v7.3.0 (#308)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [coverage](https://togithub.com/nedbat/coveragepy) | `==7.2.7` ->
`==7.3.0` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/coverage/7.3.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/coverage/7.3.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/coverage/7.2.7/7.3.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/coverage/7.2.7/7.3.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>nedbat/coveragepy (coverage)</summary>

###
[`v7.3.0`](https://togithub.com/nedbat/coveragepy/blob/HEAD/CHANGES.rst#Version-730--2023-08-12)

[Compare
Source](https://togithub.com/nedbat/coveragepy/compare/7.2.7...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:[nedbat/coveragepy#1641
.. \_issue
1646[nedbat/coveragepy#1646

.. \_changes\_7-2-7:

</details>

---

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---

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requirements.txt

@@ -1,7 +1,7 @@
 -e .
 aiofiles==23.2.1
 black==23.7.0
-coverage==7.2.7
+coverage==7.3.0
 GitPython==3.1.32
 mypy==1.5.0
 nest_asyncio==1.5.7