fix: sdk/python/requirements-dev.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-URLLIB3-14896210

Author: snyk-bot

sdk/python/requirements-dev.txt

@@ -16,3 +16,4 @@ types-PyYAML==6.0.5
 types-requests==2.27.14
 types-tabulate==0.8.6
 yapf==0.43.0
+urllib3>=2.6.3 # not directly required, pinned by Snyk to avoid a vulnerability