chore(deps): bump nh3 from 0.2.20 to 0.2.21

Bumps [nh3](https://github.com/messense/nh3) from 0.2.20 to 0.2.21.
- [Release notes](https://github.com/messense/nh3/releases)
- [Commits](messense/nh3@v0.2.20...v0.2.21)

---
updated-dependencies:
- dependency-name: nh3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

ci-constraints-requirements.txt

@@ -123,7 +123,7 @@ mypy==1.15.0 ; python_full_version >= '3.9'
     # via cryptography (pyproject.toml)
 mypy-extensions==1.0.0
     # via mypy
-nh3==0.2.20 ; python_full_version >= '3.8'
+nh3==0.2.21 ; python_full_version >= '3.8'
     # via readme-renderer
 nox==2024.4.15 ; python_full_version < '3.8'
     # via cryptography (pyproject.toml)