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

@@ -24,4 +24,5 @@ sphinx-immaterial
 sphinxcontrib-spelling
 sphinx_autodoc_typehints
 wheel
-flake8-bugbear
+flake8-bugbear
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability