Bump cliff from 4.14.0 to 4.15.0

Bumps [cliff](https://github.com/openstack/cliff) from 4.14.0 to 4.15.0.
- [Commits](openstack/cliff@4.14.0...4.15.0)

---
updated-dependencies:
- dependency-name: cliff
  dependency-version: 4.15.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pyproject.toml

@@ -20,7 +20,7 @@ license = {text = "Apache-2.0"}
 
 [dependency-groups]
 dev = [
-    "cliff>=4.14.0",
+    "cliff>=4.15.0",
     "ruff>=0.15.14",
     "pre-commit>=4.6.0"
 ]