Update dependency mkdocs-material to v9

requirements.txt

 mkdocs==1.6.0
 pymdown-extensions>=10.0
 mkdocs-material-extensions==1.3.1
-mkdocs-material==8.5.11
+mkdocs-material==9.5.21
 mkdocs-glightbox>=0.3.4
 mkdocs-video==1.5.0
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