Bump black from 24.3.0 to 25.1.0 in /cdk (#30)

Bumps [black](https://github.com/psf/black) from 24.3.0 to 25.1.0.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](psf/black@24.3.0...25.1.0)

---
updated-dependencies:
- dependency-name: black
  dependency-version: 25.1.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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Author: dependabot[bot]