pip(deps): bump idna from 3.15 to 3.18

Bumps [idna](https://github.com/kjd/idna) from 3.15 to 3.18.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.md)
- [Commits](kjd/idna@v3.15...v3.18)

---
updated-dependencies:
- dependency-name: idna
  dependency-version: '3.18'
  dependency-type: indirect
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]