Bump black from 25.12.0 to 26.3.1

Bumps [black](https://github.com/psf/black) from 25.12.0 to 26.3.1.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](psf/black@25.12.0...26.3.1)

---
updated-dependencies:
- dependency-name: black
  dependency-version: 26.3.1
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pyproject.toml

@@ -52,9 +52,9 @@ dev-flake8 = [
   "pydoclint == 0.8.3",
   "pydocstyle == 6.3.0",
 ]
-dev-formatting = ["black == 25.12.0", "isort == 7.0.0"]
+dev-formatting = ["black == 26.3.1", "isort == 7.0.0"]
 dev-mkdocs = [
-  "black == 25.12.0",
+  "black == 26.3.1",
   "Markdown==3.10.2",
   "mike == 2.2.0",
   "mkdocs-gen-files == 0.5.0",