Increase bazel CUDA tests timeout to 480s (#120443)
One of the bazel CUDA tests `//:modules_test` frequently timeout in trunk, so I try to increase the timeout value to 480s https://bazel.build/reference/test-encyclopedia to see if it helps fix the issue. Bazel CPU tests already use this value.
Here is an example timeout https://github.com/pytorch/pytorch/actions/runs/8009308009/job/21877698886#step:13:3316
Pull Request resolved: https://github.com/pytorch/pytorch/pull/120443
Approved by: https://github.com/clee2000
