fix: requirements-dev.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-REQUESTS-6928867

Author: snyk-bot

requirements-dev.txt

@@ -7,4 +7,4 @@ pytest==6.2.4
 pytest-cov==2.12.1
 pytest-flake8==1.0.7
 pytest-random-order==1.0.4
-requests==2.25.1
+requests==2.32.0