fix: requirements.txt to reduce vulnerabilities (#52)

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-WERKZEUG-6035177

Co-authored-by: snyk-bot <[email protected]>

Author: saidsef

requirements.txt

@@ -2,3 +2,4 @@
 flask==3.0.0
 flask_wtf==1.2.1
 prometheus-flask-exporter==0.22.4
+werkzeug>=3.0.1 # not directly required, pinned by Snyk to avoid a vulnerability