fix tests path

.github/workflows/unittests.yml

@@ -20,7 +20,7 @@ jobs:
             architecture: x64
         - name: Install dependencies
           run: |
-            pip install -r code/requirements.txt -r code/dev-requirements.txt -r code/backend/requirements.txt
+            pip install -r codes/requirements.txt -r codes/dev-requirements.txt -r codes/backend/requirements.txt
         - name: Check directory into codes 
           run: cd codes/
         - name: Run Python tests