update acpt image for the training ci nightly (#17521)
### Description
<!-- Describe your changes. -->
The name of nightly ACPT image has been updated to
`ptebic.azurecr.io/internal/aifx/acpt/nightly-ubuntu-cuda-torch-dev`
As the previous image alias had `cu118`, `torch210dev` or `py38`, any
version update will break the training nightly pipeline
### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
Using constant image alias to avoid pipeline failure.
