Bump idna from 3.6 to 3.7

Bumps [idna](https://github.com/kjd/idna) from 3.6 to 3.7.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v3.6...v3.7)

---
updated-dependencies:
- dependency-name: idna
  dependency-type: direct:production
...

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

requirements.txt

@@ -58,7 +58,7 @@ gunicorn==21.2.0
 holidays==0.46
 htmlmin==0.1.12
 humanize==4.9.0
-idna==3.6
+idna==3.7
 importlib-resources==6.4.0
 infinity==1.5
 intervals==0.9.2