Bump pyjwt from 2.1.0 to 2.4.0

Bumps [pyjwt](https://github.com/jpadilla/pyjwt) from 2.1.0 to 2.4.0.
- [Release notes](https://github.com/jpadilla/pyjwt/releases)
- [Changelog](https://github.com/jpadilla/pyjwt/blob/master/CHANGELOG.rst)
- [Commits](jpadilla/pyjwt@2.1.0...2.4.0)

---
updated-dependencies:
- dependency-name: pyjwt
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -2,4 +2,4 @@ decorator==4.1.2
 lxml==4.2.3
 requests==2.20.0
 six==1.10.0
-PyJWT==2.1.0
+PyJWT==2.4.0