Update dependency mkdocs-material to v9.6.8 (#1997)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[mkdocs-material](https://redirect.github.com/squidfunk/mkdocs-material)
([changelog](https://squidfunk.github.io/mkdocs-material/changelog/)) |
patch | `==9.6.7` -> `==9.6.8` |

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### Release Notes

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

###
[`v9.6.8`](https://redirect.github.com/squidfunk/mkdocs-material/releases/tag/9.6.8):
mkdocs-material-9.6.8

[Compare
Source](https://redirect.github.com/squidfunk/mkdocs-material/compare/9.6.7...9.6.8)

-   Added Welsh translations
- Fixed
[#&#8203;8076](https://redirect.github.com/squidfunk/mkdocs-material/issues/8076):
Privacy plugin crashes if HTTP download fails

</details>

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Author: slack-oss-bot

.github/workflows/mkdocs-requirements.txt

@@ -7,7 +7,7 @@ Markdown==3.7
 MarkupSafe==3.0.2
 mkdocs==1.6.1
 mkdocs-macros-plugin==1.3.7
-mkdocs-material==9.6.7
+mkdocs-material==9.6.8
 mkdocs-material-extensions==1.3.1
 Pygments==2.19.1
 pymdown-extensions==10.14.3