Bump black from 25.1.0 to 26.3.1

Bumps [black](https://github.com/psf/black) from 25.1.0 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@25.1.0...26.3.1)

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

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

Author: dependabot[bot]

requirements-dev.txt

@@ -14,7 +14,7 @@ mccabe
 pep8-naming
 pycodestyle
 pyflakes
-black==25.1.0
+black==26.3.1
 isort>=5.1, <6, !=6.0.0
 ruff>=0.14.11,<0.15
 pytype>=2020.6.1, <=2024.4.11; platform_system != "Windows"