build(deps): bump black

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]

synthtool/gcp/templates/python_notebooks_testing_pipeline/.github/workflows/linter/requirements.txt

@@ -16,7 +16,7 @@ git+https://github.com/tensorflow/docs
 ipython
 jupyter
 nbconvert
-black==24.3.0
+black==26.3.1
 pyupgrade==2.38.4
 isort==5.10.1
 flake8==5.0.4