chore(deps): update dependency pymdown-extensions to v10.15 (#1923)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[pymdown-extensions](https://redirect.github.com/facelessuser/pymdown-extensions)
| `==10.14.3` -> `==10.15` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/pymdown-extensions/10.15?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/pymdown-extensions/10.15?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/pymdown-extensions/10.14.3/10.15?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/pymdown-extensions/10.14.3/10.15?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

> [!WARNING]
> Some dependencies could not be looked up. Check the Dependency
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---

### Release Notes

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

###
[`v10.15`](https://redirect.github.com/facelessuser/pymdown-extensions/releases/tag/10.15)

[Compare
Source](https://redirect.github.com/facelessuser/pymdown-extensions/compare/10.14.3...10.15)

#### 10.15.0

- **NEW**: SuperFences: Add `relaxed_headers` option which can tolerate
bad content in the fenced code header. When
enabled, code blocks with bad content in the header will likely still
convert into code blocks, often respecting
    the specified language.
- **NEW**: Add type hints to the Blocks interface and a few additional
files.
-   **FIX**: Blocks: Fix some corner cases of nested blocks with lists.
- **FIX**: Tab and Tabbed: Fix a case where tabs could fail if
`combine_header_slug` was enabled and there was no
    header.

</details>

---

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docs/requirements.txt

@@ -2,4 +2,4 @@ mkdocs==1.6.1
 mkdocs-material==9.6.12
 mkdocs-material-extensions==1.3.1
 mkdocs-video==1.5.0
-pymdown-extensions==10.14.3
+pymdown-extensions==10.15