fix: requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-WERKZEUG-14151620

Author: snyk-bot

requirements.txt

@@ -24,5 +24,5 @@ pyrsistent==0.17.3
 pytz==2020.4
 six==1.15.0
 sqlalchemy==1.3.20
-werkzeug==0.16.1
+werkzeug==3.1.4
 zipp==3.4.0