Bump idna from 2.10 to 3.2

Bumps [idna](https://github.com/kjd/idna) from 2.10 to 3.2.
- [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...v3.2)

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

requirements.txt

@@ -14,7 +14,7 @@ Flask-SQLAlchemy==2.4.4
 Flask-WTF==0.14.3
 gevent==20.9.0
 greenlet==0.4.17
-idna==2.10
+idna==3.2
 itsdangerous==1.1.0
 Jinja2==2.11.3
 lxml>=4.6.3