Update dependency mkdocs-material to v9.1.1

This MR contains the following updates:

Package	Update	Change
mkdocs-material	minor	9.0.15 -> 9.1.1
mkdocs-material	minor	==9.0.15 -> ==9.1.1

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Release Notes

squidfunk/mkdocs-material

v9.1.1: mkdocs-material-9.1.1

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• Updated Czech and Thai translations
• Improved instant loading (scroll restoration, slow connections)
• Fixed #​5023: Instant loading not allowing to go back to initial page
• Fixed #​3797: Instant loading does not work with section anchors in Safari

v9.1.0: mkdocs-material-9.1.0

Compare Source

• Docker image now available for amd64, arm64 and arm/v7
• Updated Chinese (Taiwanese) translations
• Generalized tag identifier implementation
• Fixed flickering of header shadow on load
• Fixed occasional flickering of announcement bar

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