[rsareddy0329]

Issue #, if available:

Changelog PR for 3.28.0 release

Description of changes:

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🤖 AI code review

Routine release PR for v3.28.0. It bumps VERSION files and inter-package dependency constraints across the top-level package and the sagemaker-core/train/serve/mlops sub-packages, and adds the corresponding CHANGELOG entries. Version numbers (3.28.0 / 2.28.0 / 1.28.0) and dependency constraints are internally consistent, and the per-package changelog entries partition correctly into the top-level changelog. No issues found.

_{Reviewed commit 0da3341. Automated review; verify before acting.}