chore(deps): update dependency mkdocs-material to v9.6.6 (#1848)

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/)) |
`==9.6.5` -> `==9.6.6` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/mkdocs-material/9.6.6?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/mkdocs-material/9.6.6?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/mkdocs-material/9.6.5/9.6.6?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/mkdocs-material/9.6.5/9.6.6?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

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---

### Release Notes

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

###
[`v9.6.6`](https://redirect.github.com/squidfunk/mkdocs-material/releases/tag/9.6.6):
mkdocs-material-9.6.6

[Compare
Source](https://redirect.github.com/squidfunk/mkdocs-material/compare/9.6.5...9.6.6)

- Fixed
[#&#8203;8040](https://redirect.github.com/squidfunk/mkdocs-material/issues/8040):
Privacy plugin not replacing exteral assets (9.6.5 regression)
- Fixed
[#&#8203;8031](https://redirect.github.com/squidfunk/mkdocs-material/issues/8031):
Replace unmtaintained `regex` package in search plugin

</details>

---

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docs/requirements.txt

@@ -1,5 +1,5 @@
 mkdocs==1.6.1
-mkdocs-material==9.6.5
+mkdocs-material==9.6.6
 mkdocs-material-extensions==1.3.1
 mkdocs-video==1.5.0
 pymdown-extensions==10.14.3