Bump idna from 2.10 to 3.7

Bumps [idna](https://github.com/kjd/idna) from 2.10 to 3.7.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](https://github.com/kjd/idna/compare/v2.10...v3.7)

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

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

requirements.txt

@@ -8,7 +8,7 @@ click==8.0.1
 discord-webhook==0.14.0
 flake8==3.9.2
 Flask==2.0.1
-idna==2.10
+idna==3.7
 isort==5.8.0
 itsdangerous==2.0.1
 Jinja2==3.0.1