[XPU][CI] Update xtdk version to 'latest' in download script (#7632)

Author: plusNew001

custom_ops/xpu_ops/download_dependencies.sh

@@ -16,7 +16,7 @@ if [ "$1" == "stable" ]; then
     version_xtdk="3.4.0.1"
 else
     version_xvllm="latest"
-    version_xtdk="3.6.2.1"
+    version_xtdk="latest"
 fi
 
 (