Update dependency pymdown-extensions to v10.5 (#651)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[pymdown-extensions](https://togithub.com/facelessuser/pymdown-extensions)
| minor | `==10.4` -> `==10.5` |

---

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### Release Notes

<details>
<summary>facelessuser/pymdown-extensions (pymdown-extensions)</summary>

###
[`v10.5`](https://togithub.com/facelessuser/pymdown-extensions/releases/tag/10.5)

[Compare
Source](https://togithub.com/facelessuser/pymdown-extensions/compare/10.4...10.5)

#### 10.5

- **NEW**: Blocks: Admonitions and Details now allow configuring custom
block classes and default titles.
-   **FIX**: Keys: Ensure that Keys does not parse base64 encoded URLs.

</details>

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.github/workflows/mkdocs-requirements.txt

@@ -10,7 +10,7 @@ mkdocs-macros-plugin==1.0.5
 mkdocs-material==9.4.12
 mkdocs-material-extensions==1.3.1
 Pygments==2.17.2
-pymdown-extensions==10.4
+pymdown-extensions==10.5
 python-dateutil==2.8.2
 PyYAML==6.0.1
 repackage==0.7.3