chore(deps): update dependency pymdown-extensions to v10.19.1 (#2161)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
|
[pymdown-extensions](https://redirect.github.com/facelessuser/pymdown-extensions)
| `==10.19` -> `==10.19.1` |
![age](https://developer.mend.io/api/mc/badges/age/pypi/pymdown-extensions/10.19.1?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/pymdown-extensions/10.19/10.19.1?slim=true)
|

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### Release Notes

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

###
[`v10.19.1`](https://redirect.github.com/facelessuser/pymdown-extensions/releases/tag/10.19.1)

[Compare
Source](https://redirect.github.com/facelessuser/pymdown-extensions/compare/10.19...10.19.1)

#### 10.19.1

- **FIX**: Arithmatex: Fix issue where block `$$` math used inline
within a paragraph could result in nested math
  parsing.

</details>

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docs/requirements.txt

@@ -2,4 +2,4 @@ mkdocs==1.6.1
 mkdocs-material==9.7.0
 mkdocs-material-extensions==1.3.1
 mkdocs-video==1.5.0
-pymdown-extensions==10.19
+pymdown-extensions==10.19.1