chore(deps): update dependency mkdocs-material to v9.6.20

Author: renovate[bot]

requirements.txt

@@ -2,7 +2,7 @@ pre-commit==4.3.0
 detect-secrets==1.5.0
 autopep8==2.3.2
 black==25.1.0
-mkdocs-material==9.6.18
+mkdocs-material==9.6.20
 pymdown-extensions==10.16.1
 pygments==2.19.2
 mkdocs-mermaid2-plugin==1.2.2