Update dependency mkdocs-material to v9.1.5

This MR contains the following updates:

Package	Update	Change
mkdocs-material	patch	9.1.4 -> 9.1.5
mkdocs-material	patch	==9.1.4 -> ==9.1.5

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Release Notes

squidfunk/mkdocs-material

v9.1.5: mkdocs-material-9.1.5

Compare Source

• Updated Lithuanian and Japanese translations
• Updated Mermaid.js to version 9.4.3
• Fixed #​5290: Footer previous/next labels cut-off for short page titles

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