Update dependency mkdocs-material to v9.2.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mkdocs-material	==9.2.7 -> ==9.2.8

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Release Notes

squidfunk/mkdocs-material (mkdocs-material)

v9.2.8: mkdocs-material-9.2.8

Compare Source

• Updated Italian and Russian translations
• Fixed #​5952: Combining blog and tags plugin leads to wrong links
• Fixed #​5951: Blog plugin ignores post title in metadata
• Fixed #​5949: Blog plugin ignores post linked in nav

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