FIX: workflow.yml dependencies

Added install dependencies block to yml to install pytest module

.github/workflows/workflow.yml

@@ -38,10 +38,18 @@ jobs:
         run: |
           echo Add other actions to build,
           echo test, and deploy your project.
+
+      # Python
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
           python-version: '3.12'
+
+      # Tests
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install pytest    
       - name: Test with pytest
         run: pytest tests.py --doctest-modules --junitxml=junit/test-results-${{ matrix.python-version }}.xml
       - name: Upload pytest test results