Bump idna from 2.10 to 3.1

Bumps [idna](https://github.com/kjd/idna) from 2.10 to 3.1.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v2.10...v3.1)

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

requirements.txt

@@ -1,6 +1,6 @@
 certifi==2020.12.5
 chardet==4.0.0
-idna==2.10
+idna==3.1
 python-pushover==0.4
 requests==2.25.1
 urllib3==1.26.2