Update dependency pdoc to v14 (#196)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [pdoc](https://togithub.com/mitmproxy/pdoc) | `==13.1.1` -> `==14.0.0`
|
[![age](https://badges.renovateapi.com/packages/pypi/pdoc/14.0.0/age-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://badges.renovateapi.com/packages/pypi/pdoc/14.0.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://badges.renovateapi.com/packages/pypi/pdoc/14.0.0/compatibility-slim/13.1.1)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://badges.renovateapi.com/packages/pypi/pdoc/14.0.0/confidence-slim/13.1.1)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>mitmproxy/pdoc</summary>

###
[`v14.0.0`](https://togithub.com/mitmproxy/pdoc/blob/HEAD/CHANGELOG.md#&#8203;2023-06-19-pdoc-1400)

[Compare
Source](https://togithub.com/mitmproxy/pdoc/compare/v13.1.1...v14.0.0)

- Functions, classes and variables can now be hidden from documentation
by adding `@private` to their docstring.
([#&#8203;578](https://togithub.com/mitmproxy/pdoc/pull/578),
[@&#8203;mhils](https://togithub.com/mhils))
- pdoc can now be configured to skip classes/functions/variables without
docstrings by passing
    `--no-include-undocumented`.
([#&#8203;578](https://togithub.com/mitmproxy/pdoc/pull/578),
[@&#8203;mhils](https://togithub.com/mhils))
- pdoc now documents variables by default, even if they have no
docstring or type annotation.
Please make yourself heard in
[#&#8203;574](https://togithub.com/mitmproxy/pdoc/issues/574) if that
    introduces significant issues for your use case.
([#&#8203;575](https://togithub.com/mitmproxy/pdoc/pull/575),
[@&#8203;mhils](https://togithub.com/mhils))
-   Add support for Python 3.12.
([#&#8203;570](https://togithub.com/mitmproxy/pdoc/pull/570),
[@&#8203;mhils](https://togithub.com/mhils))
- Remove support for Python 3.7, which has reached end-of-life on
2023-06-27.
([#&#8203;569](https://togithub.com/mitmproxy/pdoc/pull/569),
[@&#8203;mhils](https://togithub.com/mhils))

</details>

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requirements_dev.txt

@@ -3,7 +3,7 @@ aiohttp==3.8.4
 freezegun==1.2.2
 mitmproxy==9.0.1
 parameterized==0.9.0
-pdoc==13.1.1
+pdoc==14.0.0
 pydantic==1.10.9
 pytest==7.3.2
 pytest-aiohttp==1.0.4