Update dependency mkdocs-material to v9.6.9 (#1097)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

docs/requirements.txt

@@ -2,7 +2,7 @@ mike==2.1.3
 mkdocs==1.6.1
 mkdocs-glightbox==0.4.0
 mkdocs-macros-plugin==1.3.7
-mkdocs-material==9.6.8
-mkdocs-material[imaging]==9.6.8
+mkdocs-material==9.6.9
+mkdocs-material[imaging]==9.6.9
 mkdocs-minify-plugin==0.8.0
 mkdocs-table-reader-plugin==3.1.0