⬆️ Upgrade Dependencies

[ebouchut]

This PR upgrades the project's dependencies:

• mkdocs from 1.4.3 to 1.5.3 (major version upgrade)
• mkdocs-material from 9.1.13 to 9.4.3
• mkdocs-htmlproofer-plugin from 0.13.1 to 1.0.0
• mkdocs-material-extensions from 1.1.1 to 1.2
• Pygments from 2.15.0 to 2.16.1
• pymdown-extensions from 10.0.1 to 10.3
• urllib3 from 1.26.14 to 2.0.6 (fixes dependabot 8)
• other dependencies have been pulled in:
  • paginate
  • pathspec
  • platformdirs

It also fixes Security vulnerability dependabot#8