build(deps-dev): bump types-pyyaml from 6.0.12.20260408 to 6.0.12.20260518 (#580)

Bumps [types-pyyaml](https://github.com/python/typeshed) from
6.0.12.20260408 to 6.0.12.20260518.
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Author: frequenz-auto-dependabot[bot]

pyproject.toml

@@ -91,7 +91,7 @@ dev-mypy = [
   "mypy == 2.1.0",
   "types-setuptools >= 67.6.0, < 83", # Should match the api dependency
   "types-Markdown == 3.10.2.20260408",
-  "types-PyYAML == 6.0.12.20260408",
+  "types-PyYAML == 6.0.12.20260518",
   "types-babel == 2.11.0.15",
   "types-colorama == 0.4.15.20260508",
   # For checking the noxfile, docs/ script, and tests