Bump black from 25.1.0 to 26.3.1 (#520)

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:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -14,7 +14,7 @@ pygments==2.20.0
 urllib3==2.6.0
 pytest==8.4.2
 isort==6.0.1
-black==25.1.0
+black==26.3.1
 flake8==7.3.0
 mypy==1.18.1
 ruamel.yaml==0.18.15