Bump types-markdown from 3.10.2.20260408 to 3.10.2.20260518 (#536)

Bumps [types-markdown](https://github.com/python/typeshed) from
3.10.2.20260408 to 3.10.2.20260518.
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Author: frequenz-auto-dependabot[bot]

pyproject.toml

@@ -66,7 +66,7 @@ dev-mypy = [
   # For checking the noxfile, docs/ script, and tests
   "frequenz-channels[dev-mkdocs,dev-noxfile,dev-pytest]",
   "mypy == 1.20.2",
-  "types-Markdown == 3.10.2.20260408",
+  "types-Markdown == 3.10.2.20260518",
 ]
 dev-noxfile = ["nox == 2026.4.10", "frequenz-repo-config[lib] == 0.17.0"]
 dev-pylint = [