Update dependency mkdocs-material to v9

This MR contains the following updates:

Package	Update	Change
mkdocs-material	major	8.5.11 -> 9.0.0
mkdocs-material	major	==8.5.11 -> ==9.0.0

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Release Notes

squidfunk/mkdocs-material

v9.0.0: mkdocs-material-9.0.0

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Additions and improvements

• Added support for rich search previews
• Added support for tokenizer lookahead
• Added support for better search highlighting
• Added support for excluding content from search
• Added support for configurable search pipeline
• Added support for offline search via offline plugin
• Added support for multiple instances of built-in tags plugin
• Added support for removing copy-to-clipboard button
• Added support for removing footer navigation
• Added support for button to view the source of a page
• Improved readability of query string for search sharing
• Improved stability of search plugin when using --dirtyreload
• Improved search result group button, now sticky and stable
• Updated Norwegian translations
• Updated MkDocs to 1.4.2

Removals

• Removed deprecated alternative admonition qualifiers
• Removed :is() selectors (in output) for easier overriding
• Removed .title suffix on translations
• Removed legacy method for providing page title in feedback URL
• Removed support for indexing only titles in search
• Removed support for custom search transforms
• Removed support for custom search workers
• Removed temporary snow feature (easter egg)

Fixes

• Fixed Norwegian and Korean language code
• Fixed detection of composition events in search interface
• Fixed search plugin not using title set via front matter
• Fixed search highlighting of tags
• Fixed search sharing URL using post transformed string
• Fixed theme-color meta tag getting out-of-sync with palette toggle
• Fixed prev/next page keyboard navigation when footer is not present
• Fixed overflowing navigation tabs not being scrollable
• Fixed inclusion of code block line numbers from search

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