fix: {{cookiecutter.github_repository_name}}/requirements.txt to redu…

…ce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-DJANGO-1090612

{{cookiecutter.github_repository_name}}/requirements.txt

@@ -1,6 +1,6 @@
 # Core
 pytz==2019.1  # django dependency
-Django==2.2.10
+Django==2.2.20
 utils2devops>=0.1.4  # the latest alway
 
 # Storages