fix(deps): update dependency pymdown-extensions to v10.4 (#1002)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[pymdown-extensions](https://github.com/facelessuser/pymdown-extensions)
| `10.3.1` -> `10.4` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/pymdown-extensions/10.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/pymdown-extensions/10.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/pymdown-extensions/10.3.1/10.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/pymdown-extensions/10.3.1/10.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

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### Release Notes

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

###
[`v10.4`](https://github.com/facelessuser/pymdown-extensions/releases/tag/10.4)

[Compare
Source](https://github.com/facelessuser/pymdown-extensions/compare/10.3.1...10.4)

#### 10.4

- **NEW**: Snippets: Allow PathLike objects for `base_path` to better
support interactions with MkDocs.
-   **FIX**: Block Admonitions: Empty titles should be respected.
-   **FIX**: Block Details: Empty summary should be respected.

</details>

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