chore(deps): update dependency mkdocs-material to v9.1.18

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mkdocs-material	==9.1.15 -> ==9.1.18

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Release Notes

squidfunk/mkdocs-material (mkdocs-material)

v9.1.18: mkdocs-material-9.1.18

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• Updated Danish translations
• Added support for installing user requirements in Docker image
• Fixed #​5655: Search separator with lookbehind breaks highlighting

v9.1.17: mkdocs-material-9.1.17

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• Fixed #​5633: Code annotations with nested lists incorrectly mounted
• Fixed #​5628: Regression in new social plugin configuration scheme

v9.1.16: mkdocs-material-9.1.16

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• Updated Indonesian translations
• Ensure scroll bar follows color scheme of operating system

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