Bump idna from 2.10 to 3.7 in /libraries/lvgl-8.2.0/docs

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](kjd/idna@v2.10...v3.7)

---
updated-dependencies:
- dependency-name: idna
  dependency-version: '3.7'
  dependency-type: direct:production
...

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

Author: dependabot[bot]

libraries/lvgl-8.2.0/docs/requirements.txt

@@ -5,7 +5,7 @@ certifi==2020.12.5
 chardet==4.0.0
 commonmark==0.9.1
 docutils==0.16
-idna==2.10
+idna==3.7
 imagesize==1.2.0
 importlib-metadata==4.0.1
 Jinja2==2.11.3