Bump werkzeug from 3.0.4 to 3.0.6 in /app/backend (#2084)

Bumps [werkzeug](https://github.com/pallets/werkzeug) from 3.0.4 to 3.0.6.
- [Release notes](https://github.com/pallets/werkzeug/releases)
- [Changelog](https://github.com/pallets/werkzeug/blob/main/CHANGES.rst)
- [Commits](pallets/werkzeug@3.0.4...3.0.6)

---
updated-dependencies:
- dependency-name: werkzeug
  dependency-type: indirect
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

app/backend/requirements.txt

@@ -416,7 +416,7 @@ urllib3==2.2.2
     # via requests
 uvicorn==0.30.6
     # via -r requirements.in
-werkzeug==3.0.4
+werkzeug==3.0.6
     # via
     #   flask
     #   quart