Bump types-markdown from 3.10.2.20260211 to 3.10.2.20260408 (#270)

Bumps [types-markdown](https://github.com/python/typeshed) from
3.10.2.20260211 to 3.10.2.20260408.
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a
href="https://github.com/python/typeshed/commits">compare view</a></li>
</ul>
</details>
<br />

Author: frequenz-auto-dependabot[bot]

pyproject.toml

@@ -77,7 +77,7 @@ dev-mkdocs = [
 dev-mypy = [
   "mypy == 1.20.2",
   "grpc-stubs == 1.53.0.6",
-  "types-Markdown == 3.10.2.20260211",
+  "types-Markdown == 3.10.2.20260408",
   "types-protobuf == 7.34.1.20260503",
   # For checking the noxfile, docs/ script, and tests
   "frequenz-client-microgrid[dev-mkdocs,dev-noxfile,dev-pytest]",