Bump black from 20.8b1 to 24.3.0 in /requirements

Bumps [black](https://github.com/psf/black) from 20.8b1 to 24.3.0.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](https://github.com/psf/black/commits/24.3.0)

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

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

requirements/developer.txt

@@ -1,2 +1,2 @@
-black==20.8b1
+black==24.3.0
 pre-commit==2.9.3