Fix GitHub Actions workflow: specify shell for test execution step

Author: alperkent

.github/workflows/test.yaml

@@ -28,7 +28,8 @@ jobs:
       run: uv sync --only-dev
     - name: Run tests
       id: run-tests
-      run: >
+      shell: bash
+      run: |
         uv run pytest \
           --junitxml=pytest.xml \
           --cov-report=term-missing:skip-covered \