fix: requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-URLLIB3-14192442
- https://snyk.io/vuln/SNYK-PYTHON-URLLIB3-14192443

Author: snyk-bot

requirements.txt

@@ -10,3 +10,4 @@ setuptools>=78.1.1
 # Development dependencies (optional)
 # For development, install with: pip install -e ".[dev]"
 # Or install from pyproject.toml: pip install pytest>=8.0.0 pytest-cov>=4.1.0
+urllib3>=2.6.0 # not directly required, pinned by Snyk to avoid a vulnerability