upgrade to cuda-12.8.1-anaconda-2024-10-py312

Author: mmcky

.github/workflows/ci.yml

@@ -4,7 +4,7 @@ jobs:
   preview:
     runs-on: quantecon-gpu
     container:
-      image: ghcr.io/quantecon/lecture-python-container:cuda-12.6.0-anaconda-2024-10-py312-b
+      image: ghcr.io/quantecon/lecture-python-container:cuda-12.8.1-anaconda-2024-10-py312
       options: --gpus all
     steps:
       - uses: actions/checkout@v4