Update requirements.txt

requirements.txt

@@ -2,7 +2,7 @@ jinja2~=3.0
 markdown~=3.2
 pygments~=2.16
 pymdown-extensions~=10.2
-mkdocs~=1.16.0
+mkdocs==1.5.3
 mkdocs-material==9.5.18
 mkdocs-material-extensions==1.3.1
 mkdocs-heti-plugin==0.1.6