Bump idna from 3.8 to 3.10 in /registrar

Bumps [idna](https://github.com/kjd/idna) from 3.8 to 3.10.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v3.8...v3.10)

---
updated-dependencies:
- dependency-name: idna
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

registrar/requirements.txt

@@ -11,7 +11,7 @@ fastapi==0.114.2
 h11==0.14.0
 httpcore==1.0.5
 httpx==0.27.2
-idna==3.8
+idna==3.10
 pycparser==2.22
 pydantic==2.9.1
 pydantic_core==2.23.2