Update dependency black to v23.9.0 (#327)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [black](https://github.com/psf/black)
([changelog](https://github.com/psf/black/blob/main/CHANGES.md)) |
`==23.7.0` -> `==23.9.0` |
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|
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|
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|
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|

---

### Release Notes

<details>
<summary>psf/black (black)</summary>

###
[`v23.9.0`](https://github.com/psf/black/blob/HEAD/CHANGES.md#2390)

[Compare Source](https://github.com/psf/black/compare/23.7.0...23.9.0)

##### Preview style

- More concise formatting for dummy implementations
([#&#8203;3796](https://github.com/psf/black/issues/3796))
- In stub files, add a blank line between a statement with a body (e.g
an
`if sys.version_info > (3, x):`) and a function definition on the same
level ([#&#8203;3862](https://github.com/psf/black/issues/3862))
- Fix a bug whereby spaces were removed from walrus operators within
subscript([#&#8203;3823](https://github.com/psf/black/issues/3823))

##### Configuration

- Black now applies exclusion and ignore logic before resolving symlinks
([#&#8203;3846](https://github.com/psf/black/issues/3846))

##### Performance

- Avoid importing `IPython` if notebook cells do not contain magics
([#&#8203;3782](https://github.com/psf/black/issues/3782))
- Improve caching by comparing file hashes as fallback for mtime and
size ([#&#8203;3821](https://github.com/psf/black/issues/3821))

##### *Blackd*

- Fix an issue in `blackd` with single character input
([#&#8203;3558](https://github.com/psf/black/issues/3558))

##### Integrations

-   Black now has an
[official pre-commit
mirror](https://github.com/psf/black-pre-commit-mirror). Swapping
`https://github.com/psf/black` to
`https://github.com/psf/black-pre-commit-mirror` in
your `.pre-commit-config.yaml` will make Black about 2x faster
([#&#8203;3828](https://github.com/psf/black/issues/3828))
- The `.black.env` folder specified by `ENV_PATH` will now be removed on
the completion
of the GitHub Action
([#&#8203;3759](https://github.com/psf/black/issues/3759))

</details>

---

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---

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---

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requirements.txt

@@ -1,6 +1,6 @@
 -e .
 aiofiles==23.2.1
-black==23.7.0
+black==23.9.0
 coverage==7.3.1
 GitPython==3.1.35
 mypy==1.5.1