Bump idna from 3.8 to 3.9 in /src (#44)

Bumps [idna](https://github.com/kjd/idna) from 3.8 to 3.9.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v3.8...v3.9)

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

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

src/requirements.txt

@@ -25,7 +25,7 @@ httpx[http2]==0.27.2
     # via -r requirements.in
 hyperframe==6.0.1
     # via h2
-idna==3.8
+idna==3.9
     # via
     #   anyio
     #   httpx