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

@@ -3,7 +3,7 @@ Babel==2.14.0
 certifi==2024.7.4
 charset-normalizer==3.3.2
 docutils==0.20.1
-idna==3.6
+idna==3.7
 imagesize==1.4.1
 Jinja2==3.1.3
 latexcodec==3.0.0