Bump idna from 2.10 to 3.4 (#38)

Bumps [idna](https://github.com/kjd/idna) from 2.10 to 3.4.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v2.10...v3.4)

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

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Author: dependabot[bot]