[rocm-libraries] ROCm/rocm-libraries#6103 (commit c74e44d)

Use ck_pytorch docker from private repo. (#6103)

## Motivation

Move the pytorch docker image used for CK testing into private repo.

## Technical Details

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## Test Plan

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## Test Result

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## Submission Checklist

- [ ] Look over the contributing guidelines at
https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.