chore(deps): bump mkdocs-material from 9.1.19 to 9.1.21

[dependabot[bot]]

Bumps mkdocs-material from 9.1.19 to 9.1.21.

Release notes

Sourced from mkdocs-material's releases.

mkdocs-material-9.1.21

• Fixed MkDocs 1.4 compat issue in social plugin (9.1.20 regression)

mkdocs-material-9.1.20

• Updated Sanskrit translations
• Fixed deprecation warnings for social plugin

Changelog

Sourced from mkdocs-material's changelog.

mkdocs-material-9.1.21+insiders-4.38.0 (2023-07-29)

• Added projects plugin for building nested projects
• Updated privacy plugin to new MkDocs API

mkdocs-material-9.1.21+insiders-4.37.1 (2023-07-28)

• Updated MkDocs to 1.5.1
• Fixed deprecation warning in social plugin due to MkDocs upgrade
• Fixed #5772: Privacy plugin fails due to API change in MkDocs

mkdocs-material-9.1.21 (2023-07-27)

• Fixed MkDocs 1.4 compat issue in social plugin (9.1.20 regression)

mkdocs-material-9.1.20 (2023-07-27)

• Fixed deprecation warnings for social plugin

mkdocs-material-9.1.19 (2023-07-18)

• Added support for MkDocs 1.5+
• Fixed #5699: Improve error reporting in social plugin

mkdocs-material-9.1.18+insiders-4.37.0 (2023-07-07)

• Added support for overriding social cards settings per page
• Added new social card default/only/image layout
• Improved resilience of optimize and social plugin
• Fixed rendering bugs for pruned navigation items
• Fixed jumping of content tabs anchor links when instant loading is enabled
• Fixed #5676: Optimize plugin doesn't check for pngquant

mkdocs-material-9.1.18 (2023-07-03)

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

mkdocs-material-9.1.17+insiders-4.36.1 (2023-06-23)

• Fixed #5618: Date comparison breaking for drafts in blog plugin

mkdocs-material-9.1.17 (2023-06-23)

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

mkdocs-material-9.1.16+insiders-4.36.0 (2023-06-15)

... (truncated)

Commits

• 98a009b Prepare 9.1.21 release
• feef806 Bumped MkDocs to 1.5.0 to mitigate error in social plugin
• 39580db Updated changelog
• 08ab76f Prepare 9.1.20 release
• 068472a Documentation
• 772421d Merge pull request #5759 from kamilkrzyskow/social-patch2
• f548d79 Updated social plugin to use theme.custom_dir
• 3e8faa0 Updated dependencies
• b72adf3 Updated documentation for custom cookies
• ea9446e Merge branch 'master' of github.com:squidfunk/mkdocs-material
• Additional commits viewable in compare view

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[dependabot[bot]]

Looks like mkdocs-material is up-to-date now, so this is no longer needed.