fix(deps): update mkdocs to 1.5.1

| datasource | package | from  | to    |
| ---------- | ------- | ----- | ----- |
| pypi       | mkdocs  | 1.5.0 | 1.5.1 |

.ci/mkdocs/requirements.txt

@@ -1,4 +1,4 @@
-mkdocs==1.5.0
+mkdocs==1.5.1
 mkdocs-macros-plugin==1.0.2
 mkdocs-material==9.1.21
 mkdocs-minify-plugin==0.7.0