Update dependency coverage to v7.2.3 (#160)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [coverage](https://togithub.com/nedbat/coveragepy) | `==7.2.2` ->
`==7.2.3` |
[![age](https://badges.renovateapi.com/packages/pypi/coverage/7.2.3/age-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://badges.renovateapi.com/packages/pypi/coverage/7.2.3/adoption-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://badges.renovateapi.com/packages/pypi/coverage/7.2.3/compatibility-slim/7.2.2)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://badges.renovateapi.com/packages/pypi/coverage/7.2.3/confidence-slim/7.2.2)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>nedbat/coveragepy</summary>

###
[`v7.2.3`](https://togithub.com/nedbat/coveragepy/blob/HEAD/CHANGES.rst#Version-723--2023-04-06)

[Compare
Source](https://togithub.com/nedbat/coveragepy/compare/7.2.2...7.2.3)

- Fix: the :ref:`config_run_sigterm` setting was meant to capture data
if a
process was terminated with a SIGTERM signal, but it didn't always. This
was
    fixed thanks to `Lewis Gaul <pull 1600_>`*, closing `issue 1599`*.

- Performance: HTML reports with context information are now much more
compact.
File sizes are typically as small as one-third the previous size, but
can be
dramatically smaller. This closes `issue 1584`\_ thanks to `Oleh Krehel
<pull 1587_>`\_.

- Development dependencies no longer use hashed pins, closing `issue
1592`\_.

.. \_issue
1584:[nedbat/coveragepy#1584
.. \_pull
1587[nedbat/coveragepy#1587
.. \_issue
159[nedbat/coveragepy#1592
.. \_issue
15[nedbat/coveragepy#1599
.. \_pull
1[nedbat/coveragepy#1600

.. \_changes\_7-2-2:

</details>

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requirements.txt

@@ -1,7 +1,7 @@
 -e .
 aiofiles==23.1.0
 black==23.3.0
-coverage==7.2.2
+coverage==7.2.3
 GitPython==3.1.31
 mypy==1.1.1
 nest_asyncio==1.5.6