fix: requirements_dev.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-ZIPP-7430899

Author: snyk-bot

requirements_dev.txt

@@ -4,3 +4,4 @@ mypy==1.11.0
 pytest==8.3.1
 pytest-cov==5.0.0
 pytest-mypy==0.10.3
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability