Update the submodule to latest dev

Le Yao · Le Yao · commit b6b1b3a4e25d · 2023-08-24T15:55:45.000+08:00
Signed-off-by: Le Yao &lt;le.yao@intel.com&gt;
diff --git a/fastchat b/fastchat
@@ -1 +1 @@
-Subproject commit 5ef2ada3f8f6820762043c66c0a474358dc06fc4
+Subproject commit effc20968c4dc48e1e525efd18873a6ef60a72c6
