Bump typing-extensions from 4.0.1 to 4.1.1

Bumps [typing-extensions](https://github.com/python/typing) from 4.0.1 to 4.1.1.
- [Release notes](https://github.com/python/typing/releases)
- [Changelog](https://github.com/python/typing/blob/master/typing_extensions/CHANGELOG)
- [Commits](https://github.com/python/typing/compare/4.0.1...4.1.1)

---
updated-dependencies:
- dependency-name: typing-extensions
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -15,4 +15,4 @@ langdetect==1.0.9
 setproctitle==1.2.2
 redis==4.1.3
 mistletoe==0.8.2
-typing_extensions==4.0.1
+typing_extensions==4.1.1