Update dependency pdoc to v13.1.1 (#162)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [pdoc](https://togithub.com/mitmproxy/pdoc) | `==13.1.0` -> `==13.1.1`
|
[![age](https://badges.renovateapi.com/packages/pypi/pdoc/13.1.1/age-slim)](https://docs.renovatebot.com/merge-confidence/)
|
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|
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|
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|

---

### Release Notes

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

###
[`v13.1.1`](https://togithub.com/mitmproxy/pdoc/blob/HEAD/CHANGELOG.md#&#8203;2023-04-24-pdoc-1311)

[Compare
Source](https://togithub.com/mitmproxy/pdoc/compare/v13.1.0...v13.1.1)

-   Fix rendering of dynamically modified docstrings.
([#&#8203;537](https://togithub.com/mitmproxy/pdoc/pull/537),
[@&#8203;mhils](https://togithub.com/mhils))
- Updated bundled markdown2 version to fix a bug with empty code blocks.
([#&#8203;537](https://togithub.com/mitmproxy/pdoc/pull/537),
[@&#8203;mhils](https://togithub.com/mhils))
- `pdoc.doc_ast.AstInfo` now has separate `func_docstrings` and
`var_docstrings` attributes
    instead of one combined one.
([#&#8203;537](https://togithub.com/mitmproxy/pdoc/pull/537),
[@&#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==13.1.0
+pdoc==13.1.1
 pydantic==1.10.7
 pytest==7.3.1
 pytest-aiohttp==1.0.4