fix: requirements.txt to reduce vulnerabilities

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

Signed-off-by: Ry Jones <ry@linux.com>

Author: snyk-bot

requirements.txt

@@ -11,3 +11,4 @@ rx >= 3.0.1
 six >= 1.4.0
 protobuf == 4.25.6
 couchdb >= 1.2
+setuptools>=78.1.1 # not directly required, pinned by Snyk to avoid a vulnerability