build(deps-dev): bump types-markdown from 3.10.2.20260518 to 3.10.2.20260712 (#186)

Bumps [types-markdown](https://github.com/python/typeshed) from
3.10.2.20260518 to 3.10.2.20260712.
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Author: frequenz-auto-dependabot[bot]

pyproject.toml

@@ -68,7 +68,7 @@ dev-mkdocs = [
 ]
 dev-mypy = [
   "mypy == 2.3.0",
-  "types-Markdown == 3.10.2.20260518",
+  "types-Markdown == 3.10.2.20260712",
   # For checking the noxfile, docs/ script, and tests
   "frequenz-core[dev-mkdocs,dev-noxfile,dev-pytest]",
 ]