Build(deps): Bump types-markdown from 3.8.0.20250708 to 3.8.0.20250809

Bumps [types-markdown](https://github.com/typeshed-internal/stub_uploader) from 3.8.0.20250708 to 3.8.0.20250809.
- [Commits](https://github.com/typeshed-internal/stub_uploader/commits)

---
updated-dependencies:
- dependency-name: types-markdown
  dependency-version: 3.8.0.20250809
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

pyproject.toml

@@ -63,7 +63,7 @@ dev-mkdocs = [
 ]
 dev-mypy = [
   "mypy == 1.17.1",
-  "types-Markdown == 3.8.0.20250708",
+  "types-Markdown == 3.8.0.20250809",
   # For checking the noxfile, docs/ script, and tests
   "frequenz-quantities[dev-mkdocs,dev-noxfile,dev-pytest,marshmallow]",
 ]