Bump the patch group with 3 updates

Bumps the patch group with 3 updates: [mkdocs-material](https://github.com/squidfunk/mkdocs-material), [mkdocstrings[python]](https://github.com/mkdocstrings/mkdocstrings) and [pytest](https://github.com/pytest-dev/pytest).


Updates `mkdocs-material` from 9.6.18 to 9.6.21
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.6.18...9.6.21)

Updates `mkdocstrings[python]` from 0.30.0 to 0.30.1
- [Release notes](https://github.com/mkdocstrings/mkdocstrings/releases)
- [Changelog](https://github.com/mkdocstrings/mkdocstrings/blob/main/CHANGELOG.md)
- [Commits](mkdocstrings/mkdocstrings@0.30.0...0.30.1)

Updates `pytest` from 8.4.1 to 8.4.2
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@8.4.1...8.4.2)

---
updated-dependencies:
- dependency-name: mkdocs-material
  dependency-version: 9.6.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: patch
- dependency-name: mkdocstrings[python]
  dependency-version: 0.30.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: patch
- dependency-name: pytest
  dependency-version: 8.4.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pyproject.toml

@@ -66,8 +66,8 @@ dev-mkdocs = [
   "mkdocs-gen-files == 0.5.0",
   "mkdocs-literate-nav == 0.6.2",
   "mkdocs-macros-plugin == 1.3.9",
-  "mkdocs-material == 9.6.18",
-  "mkdocstrings[python] == 0.30.0",
+  "mkdocs-material == 9.6.21",
+  "mkdocstrings[python] == 0.30.1",
   "mkdocstrings-python == 1.18.2",
   "frequenz-repo-config[lib] == 0.13.5",
 ]
@@ -86,7 +86,7 @@ dev-pylint = [
   "frequenz-client-microgrid[dev-mkdocs,dev-noxfile,dev-pytest]",
 ]
 dev-pytest = [
-  "pytest == 8.4.1",
+  "pytest == 8.4.2",
   "frequenz-repo-config[extra-lint-examples] == 0.13.5",
   "pytest-mock == 3.14.1",
   "pytest-asyncio == 1.1.0",