Update dependency mkdocs-material to v9.6.12

Author: renovate[bot]

.github/workflows/mkdocs-requirements.txt

@@ -6,7 +6,7 @@ lunr==0.8.0
 MarkupSafe==3.0.2
 mkdocs==1.6.1
 mkdocs-macros-plugin==1.3.7
-mkdocs-material==9.6.11
+mkdocs-material==9.6.12
 mkdocs-material-extensions==1.3.1
 Pygments==2.19.1
 pymdown-extensions==10.14.3