add Werkzeug version constraint to requirements

Werkzeug >= 3.0 causes `ImportError: cannot import name 'url_quote' from 'werkzeug.urls' (/usr/local/lib/python3.8/dist-packages/werkzeug/urls.py)` in `mediator/brotab_mediator.py`. Flask 2.0.2's requirements specify only Werkzeug >= 2.0 but should also specify Werkzeug < 3.0. Unless and until this is fixed upstream, clients of Flask 2.0.2 must specify Werkzeug < 3.0 themselves to avoid this error.

Author: doctorcolossus

requirements/base.txt

@@ -1,3 +1,4 @@
-Flask==2.0.2
 requests==2.24.0
-psutil==5.8.0
+psutil==5.8.0
+Flask==2.0.2
+Werkzeug<3.0