Bump idna from 3.6 to 3.7 in /docs

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>

docs/requirements.txt

@@ -27,7 +27,7 @@ exceptiongroup==1.2.0
 executing==2.0.1
 fastjsonschema==2.19.1
 fqdn==1.5.1
-idna==3.6
+idna==3.7
 imagesize==1.4.1
 importlib-metadata==7.0.1
 ipykernel==6.28.0