fix: requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-SETUPTOOLS-9964606

Author: snyk-bot

requirements.txt

@@ -22,3 +22,4 @@ six==1.15.0
 tld==0.12.5
 urllib3==1.26.2
 zope.interface==5.2.0
+setuptools>=78.1.1 # not directly required, pinned by Snyk to avoid a vulnerability