fix cuda version for publish_pypi workflow

Author: guocuimi

.github/workflows/publish_pypi.yml

@@ -88,7 +88,7 @@ jobs:
     strategy:
       matrix:
         python: ["3.9", "3.10", "3.11", "3.12"]
-        cuda: ["12.6"]
+        cuda: ["12.8"]
         torch: ["2.8.0"]
     runs-on: [self-hosted, linux, gpu]
     env: