Bump idna from 3.1 to 3.2

Bumps [idna](https://github.com/kjd/idna) from 3.1 to 3.2.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v3.1...v3.2)

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

requirements.txt

@@ -1,6 +1,6 @@
 certifi==2020.12.5
 chardet==4.0.0
-idna==3.1
+idna==3.2
 Jinja2==3.0.1
 kinto-http==10.7.0
 lxml==4.6.3