Bump supervisor in /{{cookiecutter.app_name}}/requirements

Bumps [supervisor](https://github.com/Supervisor/supervisor) from 4.0.4 to 4.1.0.
- [Release notes](https://github.com/Supervisor/supervisor/releases)
- [Changelog](https://github.com/Supervisor/supervisor/blob/master/CHANGES.rst)
- [Commits](https://github.com/Supervisor/supervisor/compare/4.0.4...4.1.0)

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

{{cookiecutter.app_name}}/requirements/prod.txt

@@ -20,7 +20,7 @@ WTForms==2.2.1
 # Deployment
 gevent==1.4.0
 gunicorn>=19.9.0
-supervisor==4.0.4
+supervisor==4.1.0
 
 # Webpack
 flask-webpack==0.1.0