Update dependency mkdocs-material to v9.0.8

This MR contains the following updates:

Package	Update	Change
mkdocs-material	patch	9.0.6 -> 9.0.8
mkdocs-material	patch	==9.0.6 -> ==9.0.8

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Release Notes

squidfunk/mkdocs-material

v9.0.8: mkdocs-material-9.0.8

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• Updated Croatian translations
• Updated French translations
• Updated Hungarian translations
• Updated Portuguese (Brasilian) translations
• Updated Spanish translations
• Updated Ukrainian translations
• Updated Urdu translations
• Updated Vietnamese translations

v9.0.7: mkdocs-material-9.0.7

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• Improved accessibility of sidebar navigation
• Moved all translations into community edition
• Updated Polish and Portuguese (Brasilian) translations
• Fixed info plugin terminating on subsequent reload when serving
• Fixed #​4910: Sidebar navigation labels have invalid ARIA roles
• Fixed #​4884: Search query terms can't be separated by colons

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