build(deps): bump idna from 2.9 to 3.1

Bumps [idna](https://github.com/kjd/idna) from 2.9 to 3.1.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v2.9...v3.1)

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

setup.py

@@ -42,7 +42,7 @@
         "vaderSentiment==3.3.2",
         "chardet==3.0.4",
         "Cython==0.29.17",
-        "idna==2.9",
+        "idna==3.1",
         "inflection==0.5.1",
         "joblib==1.0.1",
         "more-itertools==8.7.0",