chore(deps): bump uv from 0.9.20 to 0.9.21 (#14076)

Bumps [uv](https://github.com/astral-sh/uv) from 0.9.20 to 0.9.21.
- [Release notes](https://github.com/astral-sh/uv/releases)
- [Changelog](https://github.com/astral-sh/uv/blob/main/CHANGELOG.md)
- [Commits](astral-sh/uv@0.9.20...0.9.21)

---
updated-dependencies:
- dependency-name: uv
  dependency-version: 0.9.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

ci-constraints-requirements.txt

@@ -304,7 +304,7 @@ urllib3==2.2.3 ; python_full_version < '3.9'
     # via requests
 urllib3==2.6.2 ; python_full_version >= '3.9'
     # via requests
-uv==0.9.20
+uv==0.9.21
     # via nox
 virtualenv==20.35.4
     # via nox