chore(deps): update dependency mkdocs-material to v9.6.8 (#326)

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

Author: renovate[bot]

.github/workflows/publish-docs-requirements.txt

@@ -1,4 +1,4 @@
 mike==2.1.3
 mkdocs==1.6.1
 mkdocs-macros-plugin==1.3.7
-mkdocs-material==9.6.7
+mkdocs-material==9.6.8