Drop support for CUDA 11.8 (#723)

Author: scotts

.github/workflows/linux_cuda_wheel.yaml

@@ -67,7 +67,7 @@ jobs:
           # For the actual release we should add that label and change this to
           # include more python versions.
         python-version: ['3.9']
-        cuda-version: ['11.8', '12.6', '12.8']
+        cuda-version: ['12.6', '12.8']
         # TODO: put back ffmpeg 5 https://github.com/pytorch/torchcodec/issues/325
         ffmpeg-version-for-tests: ['4.4.2', '6', '7']