Bump idna from 2.8 to 3.7

Bumps [idna](https://github.com/kjd/idna) from 2.8 to 3.7.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v2.8...v3.7)

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

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

requirements-frozen.txt

@@ -9,7 +9,7 @@ chardet==3.0.4
 charset-normalizer==2.0.6
 frozenlist==1.4.1
 httptools==0.1.0
-idna==2.8
+idna==3.7
 idna-ssl==1.1.0
 Jinja2==3.1.4
 MarkupSafe==2.0.1