⬆️ Update mkdocs-material to v9.1.20

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mkdocs-material	==9.1.19 -> ==9.1.20

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Release Notes

squidfunk/mkdocs-material (mkdocs-material)

### [`v9.1.20`](https://togithub.com/squidfunk/mkdocs-material/releases/tag/9.1.20): mkdocs-material-9.1.20 [Compare Source](https://togithub.com/squidfunk/mkdocs-material/compare/9.1.19...9.1.20) - Updated Sanskrit translations - Fixed deprecation warnings for social plugin

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