Bump idna from 3.4 to 3.6 (#965)

Bumps [idna](https://github.com/kjd/idna) from 3.4 to 3.6.
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v3.4...v3.6)

---
updated-dependencies:
- dependency-name: idna
  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>

requirements/test.txt

@@ -1,5 +1,5 @@
 -r cython.txt
-idna==3.4
+idna==3.6
 multidict==6.0.4
 pytest==7.4.3
 pytest-cov>=2.3.1