Update dependency mkdocs-material to v9.6.7

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mkdocs-material (changelog)	9.6.3 -> 9.6.7

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Release Notes

squidfunk/mkdocs-material (mkdocs-material)

v9.6.7: mkdocs-material-9.6.7

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• 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

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

v9.6.5: mkdocs-material-9.6.5

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• Fixed #​8016: Tags listing not showing when when file name has spaces
• Fixed #​8012: Privacy plugin crashes if HTTP download fails

v9.6.4: mkdocs-material-9.6.4

Compare Source

• Fixed #​7985: Blog content sometimes not stretching to full width
• Fixed #​7978: Navigation rendering bug in Safari 18.3

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