Update dependency docs/mkdocs-material to v9.5.21

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
docs/mkdocs-material (changelog)	==9.5.19 -> ==9.5.21

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Release Notes

squidfunk/mkdocs-material (docs/mkdocs-material)

v9.5.21: mkdocs-material-9.5.21

Compare Source

• Fixed #​7133: Ensure latest version of Mermaid.js is used
• Fixed #​7125: Added warning for dotfiles in info plugin

Thanks to @​kamilkrzyskow for their contributions

v9.5.20: mkdocs-material-9.5.20

Compare Source

• Fixed deprecation warning in privacy plugin (9.5.19 regression)
• Fixed #​7119: Tags plugin emits deprecation warning (9.5.19 regression)
• Fixed #​7118: Social plugin crashes if fonts are disabled (9.5.19 regression)
• Fixed #​7085: Social plugin crashes on Windows when downloading fonts

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