Bump werkzeug from 2.3.4 to 3.0.6 in /backend (#55)

Bumps [werkzeug](https://github.com/pallets/werkzeug) from 2.3.4 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@2.3.4...3.0.6)

---
updated-dependencies:
- dependency-name: werkzeug
  dependency-type: direct:production
...

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backend/requirements.txt

@@ -4,5 +4,5 @@ PyJWT==2.7.0
 PyNaCl==1.5.0
 ruamel.yaml==0.17.26
 ruamel.yaml.string==0.1.1
-Werkzeug==2.3.4
+Werkzeug==3.0.6
 python-dateutil==2.8.2