docs(pull requests): update the pull requests checklist to add a security check (#516)

Author: arnaudbesnier

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,8 +1,11 @@
-## Pull Request checklist:
+## Definition of Done
+
+### General
 
 - [ ] Write an explicit title for the Pull Request, following [Conventional Commits specification](https://www.conventionalcommits.org)
-- [ ] Create automatic tests
-- [ ] No automatic tests failures
 - [ ] Test manually the implemented changes
-- [ ] Review my own code (indentation, syntax, style, simplicity, readability)
-- [ ] Wonder if you can improve the existing code
+- [ ] Validate the code quality (indentation, syntax, style, simplicity, readability)
+
+### Security
+
+- [ ] Consider the security impact of the changes made