Bump the optional group with 4 updates

Bumps the optional group with 4 updates: [polars](https://github.com/pola-rs/polars), [mkdocs-material](https://github.com/squidfunk/mkdocs-material), [mkdocstrings[python]](https://github.com/mkdocstrings/mkdocstrings) and [pytest](https://github.com/pytest-dev/pytest).


Updates `polars` from 0.18.15 to 0.19.1
- [Release notes](https://github.com/pola-rs/polars/releases)
- [Commits](pola-rs/polars@py-0.18.15...py-0.19.1)

Updates `mkdocs-material` from 9.2.5 to 9.2.7
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.2.5...9.2.7)

Updates `mkdocstrings[python]` from 0.22.0 to 0.23.0
- [Release notes](https://github.com/mkdocstrings/mkdocstrings/releases)
- [Changelog](https://github.com/mkdocstrings/mkdocstrings/blob/main/CHANGELOG.md)
- [Commits](mkdocstrings/mkdocstrings@0.22.0...0.23.0)

Updates `pytest` from 7.4.0 to 7.4.1
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@7.4.0...7.4.1)

---
updated-dependencies:
- dependency-name: polars
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: optional
- dependency-name: mkdocs-material
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: optional
- dependency-name: mkdocstrings[python]
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: optional
- dependency-name: pytest
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: optional
...

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

Author: dependabot[bot]

pyproject.toml

@@ -56,15 +56,15 @@ dev-flake8 = [
   "pydoclint == 0.3.1",
   "pydocstyle == 6.3.0",
 ]
-dev-examples = ["polars == 0.18.15"]
+dev-examples = ["polars == 0.19.1"]
 dev-formatting = ["black == 23.7.0", "isort == 5.12.0"]
 dev-mkdocs = [
   "mike == 1.1.2",
   "mkdocs-gen-files == 0.5.0",
   "mkdocs-literate-nav == 0.6.0",
-  "mkdocs-material == 9.2.5",
+  "mkdocs-material == 9.2.7",
   "mkdocs-section-index == 0.3.5",
-  "mkdocstrings[python] == 0.22.0",
+  "mkdocstrings[python] == 0.23.0",
   "frequenz-repo-config[lib] == 0.6.1",
 ]
 dev-mypy = [
@@ -88,7 +88,7 @@ dev-pylint = [
   "frequenz-sdk[dev-mkdocs,dev-noxfile,dev-pytest]",
 ]
 dev-pytest = [
-  "pytest == 7.4.0",
+  "pytest == 7.4.1",
   "frequenz-repo-config[extra-lint-examples] == 0.6.1",
   "pytest-mock == 3.11.1",
   "pytest-asyncio == 0.21.1",