fix: requirements-dev.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-URLLIB3-10390193
- https://snyk.io/vuln/SNYK-PYTHON-URLLIB3-10390194

Author: snyk-bot

requirements-dev.txt

@@ -20,3 +20,4 @@ twine~=6.1.0
 types-retry~=0.9.9.20241221
 networkx~=3.1.0
 networkx-stubs~=0.0.1
+urllib3>=2.5.0 # not directly required, pinned by Snyk to avoid a vulnerability