build(deps-dev): bump mkdocs-material from 9.1.19 to 9.1.21 (#1156)

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 9.1.19 to 9.1.21.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](https://github.com/squidfunk/mkdocs-material/compare/9.1.19...9.1.21)

---
updated-dependencies:
- dependency-name: mkdocs-material
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

poetry.lock

@@ -1377,20 +1377,20 @@ mkdocs = ">=1.0.3"
 
 [[package]]
 name = "mkdocs-material"
-version = "9.1.19"
+version = "9.1.21"
 description = "Documentation that simply works"
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "mkdocs_material-9.1.19-py3-none-any.whl", hash = "sha256:fb0a149294b319aedf36983919d8c40c9e566db21ead16258e20ebd2e6c0961c"},
-    {file = "mkdocs_material-9.1.19.tar.gz", hash = "sha256:73b94b08c765e92a80645aac58d6a741fc5f587deec2b715489c714827b15a6f"},
+    {file = "mkdocs_material-9.1.21-py3-none-any.whl", hash = "sha256:58bb2f11ef240632e176d6f0f7d1cff06be1d11c696a5a1b553b808b4280ed47"},
+    {file = "mkdocs_material-9.1.21.tar.gz", hash = "sha256:71940cdfca84ab296b6362889c25395b1621273fb16c93deda257adb7ff44ec8"},
 ]
 
 [package.dependencies]
 colorama = ">=0.4"
 jinja2 = ">=3.0"
 markdown = ">=3.2"
-mkdocs = ">=1.4.2"
+mkdocs = ">=1.5.0"
 mkdocs-material-extensions = ">=1.1"
 pygments = ">=2.14"
 pymdown-extensions = ">=9.9.1"