Merge pull request #181 from frequenz-floss/dependabot/pip/black-26.3.1

Bump black from 25.9.0 to 26.3.1

Author: frequenz-auto-dependabot[bot]

pyproject.toml

@@ -69,10 +69,10 @@ dev-flake8 = [
   "pydoclint == 0.8.3",
   "pydocstyle == 6.3.0",
 ]
-dev-formatting = ["black == 25.9.0", "isort == 6.1.0"]
+dev-formatting = ["black == 26.3.1", "isort == 6.1.0"]
 dev-mkdocs = [
   "Markdown == 3.10.2",
-  "black == 25.9.0",
+  "black == 26.3.1",
   "mike == 2.2.0",
   "mkdocs-gen-files == 0.5.0",
   "mkdocs-literate-nav == 0.6.2",