fix(hf): correct HF neuronx pytorch version (#5501)

The pytorch version was incorrect, the available image is v2.8 and not
v2.7.

Co-authored-by: Molly He <mollyhe@amazon.com>

Author: tengomucho

sagemaker-core/src/sagemaker/core/image_uri_config/huggingface-neuronx.json

@@ -640,9 +640,9 @@
             },
             "4.55.4": {
                 "version_aliases": {
-                    "pytorch2.7": "pytorch2.7.1"
+                    "pytorch2.8": "pytorch2.8.0"
                 },
-                "pytorch2.7.1": {
+                "pytorch2.8.0": {
                     "py_versions": [
                         "py310"
                     ],