Update mkdocs-material to 8.1.9

[pyup-bot]

This PR updates mkdocs-material from 8.1.8 to 8.1.9.

Changelog

8.1.9

* Added support for mkdocs.yml validation and auto-complete
* Fixed errors in Latvian translations

mkdocs-material-8.1.8+insiders-4.7.0 (2022-01-25)

* Added native support for offline search

Links

• PyPI: https://pypi.org/project/mkdocs-material
• Changelog: https://pyup.io/changelogs/mkdocs-material/
• Repo: https://squidfunk.github.io/mkdocs-material/

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
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[codecov]

Codecov Report

Merging #1132 (bda3198) into master (ae4eccb) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1132   +/-   ##
=======================================
  Coverage   78.77%   78.77%           
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  Files         244      244           
  Lines        6800     6800           
=======================================
  Hits         5357     5357           
  Misses       1113     1113           
  Partials      330      330