chore(deps): update dependency mkdocs to v1.3.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mkdocs (source)	==1.3.0 -> ==1.3.1

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Release Notes

mkdocs/mkdocs

### [`v1.3.1`](https://togithub.com/mkdocs/mkdocs/releases/tag/1.3.1) [Compare Source](https://togithub.com/mkdocs/mkdocs/compare/1.3.0...1.3.1) - Pin Python-Markdown version to <3.4, thus excluding its latest release that breaks too many external extensions ([#​2893](https://togithub.com/mkdocs/mkdocs/issues/2893)) - When a Markdown extension fails to load, print its name and traceback ([#​2894](https://togithub.com/mkdocs/mkdocs/issues/2894)) - Bugfix for "readthedocs" theme (regression in 1.3.0): add missing space in breadcrumbs ([#​2810](https://togithub.com/mkdocs/mkdocs/issues/2810)) - Bugfix: don't complain when a file "readme.md" (lowercase) exists, it's not recognized otherwise ([#​2852](https://togithub.com/mkdocs/mkdocs/issues/2852)) - Built-in themes now also support these languages: - Italian ([#​2860](https://togithub.com/mkdocs/mkdocs/issues/2860)) Other small improvements; see [commit log](https://togithub.com/mkdocs/mkdocs/compare/1.3.0...1.3.1).

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Unit Test Results

366 tests  ±0   366 :heavy_check_mark: ±0   28s :stopwatch: +2s 154 suites ±0       0 :zzz: ±0  154 files   ±0       0 :x: ±0 

Results for commit da97ac33. ± Comparison against base commit 5c6b8169.