Call setup-node before checkout

Signed-off-by: Huy Do <huydhn@gmail.com>

Author: huydhn

.github/workflows/flash_attention.yml

@@ -21,6 +21,9 @@ jobs:
       image: nvcr.io/nvidia/pytorch:25.06-py3
       options: --gpus all --ipc=host --ulimit memlock=-1 --ulimit stack=67108864
     steps:
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
       - uses: actions/checkout@v4
         with:
           repository: 'Dao-AILab/flash-attention'