fix: pip-sample/requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-WERKZEUG-6808933

pip-sample/requirements.txt

@@ -61,6 +61,6 @@ urllib3==1.23
 virtualenv==16.0.0
 wcwidth==0.1.7
 webencodings==0.5.1
-Werkzeug==0.14.1
+Werkzeug==3.0.3
 widgetsnbextension==3.4.2
 xlrd==1.1.0