fix(deps): update gunicorn and requests to address security vulnerabilities

- gunicorn 21.2.0 → 23.0.0: fixes CVE-2024-1135 (HTTP Request Smuggling)
- requests 2.31.0 → 2.32.3: fixes CVE-2024-35195 (Session verify bypass)
  and .netrc credentials leak vulnerability

Author: claude

monitoring_flask_backend/requirements.txt

@@ -1,6 +1,6 @@
 Flask==3.0.0
 prometheus-api-client==0.5.4
 python-dateutil==2.8.2
-gunicorn==21.2.0
-requests==2.31.0
+gunicorn==23.0.0
+requests==2.32.3
 pytest==8.3.4