chore(deps): bump mkdocs from 1.3.0 to 1.3.1

[dependabot[bot]]

Bumps mkdocs from 1.3.0 to 1.3.1.

Release notes

Sourced from mkdocs's releases.

1.3.1

• Pin Python-Markdown version to <3.4, thus excluding its latest release that breaks too many external extensions (#2893)

• When a Markdown extension fails to load, print its name and traceback (#2894)

• Bugfix for "readthedocs" theme (regression in 1.3.0): add missing space in breadcrumbs (#2810)

• Bugfix: don't complain when a file "readme.md" (lowercase) exists, it's not recognized otherwise (#2852)

• Built-in themes now also support these languages:

  • Italian (#2860)

Other small improvements; see commit log.

Commits

• a17a25c Release 1.3.1 (#2895)
• dd7986f Requirements: pin Markdown version to <3.4 (#2893)
• 6bd62b9 When a Markdown extension fails to load, print its name and traceback (#2894)
• d93feff Italian translation for mkdocs and readthedocs themes (#2860)
• 03b4893 Docs: site_url is optional (#2863)
• 042d7c2 Check only for uppercase README.md file (#2852)
• 82bd8ba Clean up code style (#2825)
• c32fbe3 Fix typo in configuration.md (#2844)
• cdf8a26 Added an extra space to the readthedocs theme breadcrumbs (#2810)
• See full diff in compare view

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