chore: update black requirement in the pip group (#903)

Updates the requirements on [black](https://github.com/psf/black) to permit the latest version.

Updates `black` to 26.5.1
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](psf/black@26.5.0...26.5.1)

---
updated-dependencies:
- dependency-name: black
  dependency-version: 26.5.1
  dependency-type: direct:production
  dependency-group: pip
...

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Author: dependabot[bot]

requirements.txt

@@ -1,4 +1,4 @@
 jinja2~=3.1.6
 pylint~=4.0.5
-black~=26.5.0
+black~=26.5.1
 mkdocs~=1.6.1