fix ci; specify flash-attn version

Author: YeAnbang

.github/workflows/run_chatgpt_examples.yml

@@ -31,7 +31,7 @@ jobs:
 
       - name: Install flash-attention
         run: |
-          pip install flash-attn==2.5.8 --no-build-isolation
+          pip install flash-attn==2.7.4.post1 --no-build-isolation
 
       - name: Install Colossal-AI
         run: |