Update testing.yml

Author: JerBouma

.github/workflows/testing.yml

@@ -20,10 +20,10 @@ jobs:
               with:
                 python-version: '3.10'
 
-            - name: Install dependencies
-              run: |
-                    python -m pip install --upgrade pip
-                    pip install "pandas[excel]" financedatabase pytest 
+            - name: Install Poetry
+              run: pip install poetry
+            - name: Update dependencies
+              run: poetry install
             - name: Run tests
               run: |
-                    pytest tests/
+                    poetry run pytest tests/