Bump black from 24.3.0 to 26.3.1

Bumps [black](https://github.com/psf/black) from 24.3.0 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@24.3.0...26.3.1)

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

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

Author: dependabot[bot]

requirements.txt

@@ -4,7 +4,7 @@ watchdog @ git+https://github.com/gorakhargosh/watchdog.git@f3e78cd4d9500d287bd1
 pytest==9.0.2
 pytest-xdist==3.8.0
 tox==4.4.5
-black==24.3.0
+black==26.3.1
 pre-commit==2.21.0
 pygobject<3.51
 pygobject-stubs