Bump mkdocs from 1.3.1 to 1.4.0

Bumps [mkdocs](https://github.com/mkdocs/mkdocs) from 1.3.1 to 1.4.0.
- [Release notes](https://github.com/mkdocs/mkdocs/releases)
- [Commits](mkdocs/mkdocs@1.3.1...1.4.0)

---
updated-dependencies:
- dependency-name: mkdocs
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

poetry.lock

@@ -17,7 +17,7 @@ semver = "^2.13.0"
 gitpython = "^3.1.27"
 mdx_truly_sane_lists = "^1.3"
 mike = "^1.1.2"
-mkdocs = "^1.3.1"
+mkdocs = "^1.4.0"
 mkdocs-material = "^8.5.3"
 
 [tool.poetry.dev-dependencies]