chore(deps): bump ruff from 0.15.20 to 0.15.21

Bumps [ruff](https://github.com/astral-sh/ruff) from 0.15.20 to 0.15.21.
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](https://github.com/astral-sh/ruff/compare/0.15.20...0.15.21)

---
updated-dependencies:
- dependency-name: ruff
  dependency-version: 0.15.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements.txt

@@ -1,5 +1,5 @@
 questionary==2.1.1
 rich==15.0.0
 # dev
-ruff==0.15.20
+ruff==0.15.21
 pre-commit==4.6.0