Update dependency mkdocs-material to v9.5.6 (#293)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [mkdocs-material](https://togithub.com/squidfunk/mkdocs-material) |
`9.5.5` -> `9.5.6` |
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|
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|
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|
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|

---

### Release Notes

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

###
[`v9.5.6`](https://togithub.com/squidfunk/mkdocs-material/releases/tag/9.5.6):
mkdocs-material-9.5.6

[Compare
Source](https://togithub.com/squidfunk/mkdocs-material/compare/9.5.5...9.5.6)

- Fixed
[#&#8203;6700](https://togithub.com/squidfunk/mkdocs-material/issues/6700):
Missing styles for Mermaid.js labels with Markdown

</details>

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