Add tests/** to CI path triggers

Tests directory changes were not triggering CI runs.

Author: manascb1344

.github/workflows/ci-cd.yml

@@ -6,6 +6,7 @@ on:
       - main
     paths:
       - 'src/**'
+      - 'tests/**'
       - '*.py'
       - 'requirements.txt'
       - 'pyproject.toml'