refactor(conventional-pr): add security to conventional-pr scope

- Added "security" to the list of accepted scopes in conventional-pr.yml
- This aims to cater for security-related pull requests in the future

.github/workflows/conventional-pr.yml

@@ -35,6 +35,7 @@ jobs:
             ci
             build
             revert
+            security
           requireScope: false
           subjectPattern: ^(?![A-Z]).+$
           subjectPatternError: |