Update testing.yml

Caching the dependencies is breaking tests as the code in the repo does not get updated. I also removed clutter in the step that runs the tests

.github/workflows/testing.yml

@@ -55,8 +55,5 @@ jobs:
           
       - name: Test with pytest
         run: |
-          pytest tests/test_preprocessing.py
-          pytest tests/test_svd.py
-          pytest tests/test_map_to_map.py
-          pytest tests/test_distribution_to_distribution.py
+          pytest tests/