New version of Werkzeug breaks Flask, and then Redash

[DavidHernandez]

Issue Summary

Last night, Werkzeug released a new major version (from 0.16.1 to 1.0.0). Flask has declared this dependency as Werkzeug>=0.15. When building a new instance of the project, Flask downloads the last version of Werkzeug that breaks it's integration. So, Redash get's broken too. The use of Werkzeug that Redash does should be updated too.

Steps to Reproduce

1. Just build the project: docker-compose up --build

Technical details:

• Redash Version: probably most versions of Redash
• Issue on Flask: New version of Werkzeug is not compatible with Flask pallets/flask#3486