Update dependency mkdocs-material to v9.1.19

This MR contains the following updates:

Package	Update	Change
mkdocs-material	patch	9.1.18 -> 9.1.19
mkdocs-material	patch	==9.1.18 -> ==9.1.19

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Release Notes

squidfunk/mkdocs-material

v9.1.19: mkdocs-material-9.1.19

Compare Source

• Added support for MkDocs 1.5+
• Fixed #​5699: Improve error reporting in social plugin

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