fix: {{cookiecutter.project_slug}}/requirements.txt to reduce vulnera…

…bilities

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

{{cookiecutter.project_slug}}/requirements.txt

@@ -162,3 +162,4 @@ wheel==0.37.0
 # The following packages are considered to be unsafe in a requirements file:
 # pip
 # setuptools
+zipp>=3.19.1 # not directly required, pinned by Snyk to avoid a vulnerability