[Dependent Bot] Fix transformer version (#1159)

*Issue #, if available:*

Successfully test on internal regression test.
Solve the warning on
https://github.com/awslabs/graphstorm/security/dependabot/17.

*Description of changes:*


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setup.py

@@ -28,7 +28,7 @@ def find_version(*file_paths):
 requirements = [
     'h5py',
     'pyarrow',
-    'transformers==4.36.0',
+    'transformers==4.48.0',
     'pandas',
     'scikit-learn',
     'ogb==1.3.6',