Update dependency mkdocs-material to v9.5.6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mkdocs-material	9.5.5 -> 9.5.6

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Release Notes

squidfunk/mkdocs-material (mkdocs-material)

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

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Configuration

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