chore(deps-dev): bump idna from 3.7 to 3.8

Bumps [idna](https://github.com/kjd/idna) from 3.7 to 3.8.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v3.7...v3.8)

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

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

requirements-dev.txt

@@ -22,7 +22,7 @@ flit==3.9.0
 
 flit-core==3.9.0 ; python_version >= '3.6'
 
-idna==3.7 ; python_version >= '3.5'
+idna==3.8 ; python_version >= '3.5'
 
 importlib-metadata==6.8.0 ; python_version >= '3.7'