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:production
  update-type: version-update:semver-minor
...

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

{{ cookiecutter.project_slug }}/doc-requirements.txt

@@ -22,7 +22,7 @@ ghp-import==2.1.0
     # via mkdocs
 griffe==0.48.0
     # via mkdocstrings-python
-idna==3.7
+idna==3.8
     # via requests
 jinja2==3.1.4
     # via