fix ci; specify flash-attn version

Author: YeAnbang

.github/workflows/run_chatgpt_examples.yml

@@ -29,13 +29,9 @@ jobs:
       - name: Checkout ColossalAI
         uses: actions/checkout@v2
 
-      - name: Install PyTorch
-        run: |
-          pip install torch==2.5.1
-
       - name: Install flash-attention
         run: |
-          pip install flash-attn==2.7.4.post1 --no-build-isolation
+          pip install flash-attn==2.5.8 --no-build-isolation
 
       - name: Install Colossal-AI
         run: |