fix: requirements.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.txt

@@ -4,3 +4,4 @@ requests~=2.32.3
 pylint
 bson>=0.5.9
 requests-toolbelt>=1.0.0
+urllib3>=2.5.0 # not directly required, pinned by Snyk to avoid a vulnerability