Update dependency pdoc to v13.1.0 (#153)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [pdoc](https://togithub.com/mitmproxy/pdoc) | `==13.0.1` -> `==13.1.0`
|
[![age](https://badges.renovateapi.com/packages/pypi/pdoc/13.1.0/age-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://badges.renovateapi.com/packages/pypi/pdoc/13.1.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://badges.renovateapi.com/packages/pypi/pdoc/13.1.0/compatibility-slim/13.0.1)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://badges.renovateapi.com/packages/pypi/pdoc/13.1.0/confidence-slim/13.0.1)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v13.1.0`](https://togithub.com/mitmproxy/pdoc/blob/HEAD/CHANGELOG.md#&#8203;2023-03-31-pdoc-1310)

[Compare
Source](https://togithub.com/mitmproxy/pdoc/compare/v13.0.1...v13.1.0)

- Add support for rendering [Mermaid diagrams](https://mermaid.js.org/)
by passing `--mermaid`.
([#&#8203;525](https://togithub.com/mitmproxy/pdoc/pull/525),
[@&#8203;thearchitector](https://togithub.com/thearchitector),
[@&#8203;mhils](https://togithub.com/mhils))
- Add rudimentary support for `typing_extensions.Literal` on Python 3.7.
([#&#8203;527](https://togithub.com/mitmproxy/pdoc/pull/527),
[@&#8203;mhils](https://togithub.com/mhils))

</details>

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requirements.txt

@@ -6,7 +6,7 @@ GitPython==3.1.31
 mypy==1.1.1
 nest_asyncio==1.5.6
 networkx==3.0
-pdoc==13.0.1
+pdoc==13.1.0
 pip==23.0.1
 pre-commit==3.2.1
 pydantic==1.10.7