Bump idna from 2.10 to 3.0

Bumps [idna](https://github.com/kjd/idna) from 2.10 to 3.0.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v2.10...v3.0)

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

requirements.txt

@@ -9,7 +9,7 @@ cornice-swagger==1.0.0
 dockerflow==2020.10.0
 elasticsearch==7.10.1
 hupper==1.10.2
-idna==2.10
+idna==3.0
 iso8601==0.1.13
 jsonpatch==1.28
 jsonpointer==2.0