chore(deps): update dependency mkdocs-material to v9.6.15 (#2008)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[mkdocs-material](https://redirect.github.com/squidfunk/mkdocs-material)
([changelog](https://squidfunk.github.io/mkdocs-material/changelog/)) |
`==9.6.14` -> `==9.6.15` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/mkdocs-material/9.6.15?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/mkdocs-material/9.6.15?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/mkdocs-material/9.6.14/9.6.15?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/mkdocs-material/9.6.14/9.6.15?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

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---

### Release Notes

<details>
<summary>squidfunk/mkdocs-material (mkdocs-material)</summary>

###
[`v9.6.15`](https://redirect.github.com/squidfunk/mkdocs-material/releases/tag/9.6.15):
mkdocs-material-9.6.15

[Compare
Source](https://redirect.github.com/squidfunk/mkdocs-material/compare/9.6.14...9.6.15)

- Updated Mongolian translations
- Improved semantic markup of "edit this page" button
- Improved info plugin virtual environment resolution
- Fixed
[#&#8203;8291](https://redirect.github.com/squidfunk/mkdocs-material/issues/8291):
Large font size setting throws of breakpoints in JavaScript

</details>

---

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docs/requirements.txt

@@ -1,5 +1,5 @@
 mkdocs==1.6.1
-mkdocs-material==9.6.14
+mkdocs-material==9.6.15
 mkdocs-material-extensions==1.3.1
 mkdocs-video==1.5.0
 pymdown-extensions==10.16