Pin flask and werkzeug versions

Summary:
Master is currently broken because we pull werkzeug 3.0.0, and get the error:
```
ImportError: cannot import name 'url_quote' from 'werkzeug.urls' (/tmp/tmp.0Kj6PPT3ru/env/lib/python3.8/site-packages/werkzeug/urls.py)
```
Pinning the version seem to fix the problem.

Reviewed By: anwesht

Differential Revision: D50179303

fbshipit-source-id: ca7b6168ffef4ea728888783f02793684dc845bc

requirements.txt

@@ -1,6 +1,6 @@
 click==8.1.3
 click-log==0.4.0
-Flask==2.1.2
+Flask==2.3.3
 Flask-Cors==3.0.10
 Flask-GraphQL==2.0.1
 graphene<3.0
@@ -15,3 +15,4 @@ traitlets==5.2.2.post1
 typing-extensions==4.2.0
 xxhash==3.0.0
 zstandard==0.17.0
+Werkzeug==2.3.7