Update dependency mkdocs-material to v9.6.7

This MR contains the following updates:

Package	Update	Change
mkdocs-material (changelog)	patch	==9.6.5 -> ==9.6.7

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Release Notes

squidfunk/mkdocs-material (mkdocs-material)

v9.6.7: mkdocs-material-9.6.7

Compare Source

• Fixed #​8056: Error in backrefs implementation (9.6.6 regression)
• Fixed #​8054: Unescaped quotes in ARIA labels of table of contents

v9.6.6: mkdocs-material-9.6.6

Compare Source

• Fixed #​8040: Privacy plugin not replacing exteral assets (9.6.5 regression)
• Fixed #​8031: Replace unmaintained regex package in search plugin

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