fix(deps): update dependency mkdocs-material to v9.5.21 (#16)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [mkdocs-material](https://github.com/squidfunk/mkdocs-material)
([changelog](https://squidfunk.github.io/mkdocs-material/changelog/)) |
`9.5.20` -> `9.5.21` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/mkdocs-material/9.5.21?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/mkdocs-material/9.5.21?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/mkdocs-material/9.5.20/9.5.21?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/mkdocs-material/9.5.20/9.5.21?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v9.5.21`](https://github.com/squidfunk/mkdocs-material/releases/tag/9.5.21):
mkdocs-material-9.5.21

[Compare
Source](https://github.com/squidfunk/mkdocs-material/compare/9.5.20...9.5.21)

- Fixed
[#&#8203;7133](https://github.com/squidfunk/mkdocs-material/issues/7133):
Ensure latest version of Mermaid.js is used
- Fixed
[#&#8203;7125](https://github.com/squidfunk/mkdocs-material/issues/7125):
Added warning for dotfiles in info plugin

Thanks to [@&#8203;kamilkrzyskow](https://github.com/kamilkrzyskow)
for their contributions

</details>

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