Revert "Fix syntax error in YAML file of rapids CI"

Author: y0z

.github/workflows/rapids.yml

@@ -28,8 +28,9 @@ jobs:
           pip install --progress-bar off -U setuptools
           pip install git+https://github.com/optuna/optuna.git
           python -c 'import optuna'
-      - name: Run examples
-        run: |
-          python -m py_compile rapids/rapids_simple.py  # due to difficulty in importing, compile only
-        env:
-          OMP_NUM_THREADS: 1
+
+    - name: Run examples
+      run: |
+        python -m py_compile rapids/rapids_simple.py  # due to difficulty in importing, compile only
+      env:
+        OMP_NUM_THREADS: 1