chore(deps): bump idna from 3.17 to 3.18 in /hack/api-docs (#6439)

Bumps [idna](https://github.com/kjd/idna) from 3.17 to 3.18.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.md)
- [Commits](https://github.com/kjd/idna/compare/v3.17...v3.18)

---
updated-dependencies:
- dependency-name: idna
  dependency-version: '3.18'
  dependency-type: direct:production
  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>

hack/api-docs/requirements.txt

@@ -6,7 +6,7 @@ colorama==0.4.6
 csscompressor==0.9.5
 ghp-import==2.1.0
 htmlmin==0.1.12
-idna==3.17
+idna==3.18
 importlib-metadata==9.0.0
 importlib-resources==7.1.0
 Jinja2==3.1.6