Bump requests from 2.21.0 to 2.22.0 in /src/requirements

Bumps [requests](https://github.com/requests/requests) from 2.21.0 to 2.22.0.
- [Release notes](https://github.com/requests/requests/releases)
- [Changelog](https://github.com/kennethreitz/requests/blob/master/HISTORY.md)
- [Commits](https://github.com/requests/requests/compare/v2.21.0...v2.22.0)

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

src/requirements/production.txt

@@ -32,7 +32,7 @@ python-magic==0.4.15
 python3-openid==3.1.0
 pytz==2019.1
 qrcode==6.1
-requests==2.21.0
+requests==2.22.0
 requests-oauthlib==1.2.0
 six==1.12.0
 sqlparse==0.3.0