fix: requirements/base.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-SETUPTOOLS-3180412
- https://snyk.io/vuln/SNYK-PYTHON-WERKZEUG-6035177

requirements/base.txt

@@ -406,3 +406,4 @@ zipp==3.15.0
 
 # The following packages are considered to be unsafe in a requirements file:
 # setuptools
+setuptools>=65.5.1 # not directly required, pinned by Snyk to avoid a vulnerability