[rsareddy0329]

Issue #, if available:

Description of changes:
Changelog PR for the release 3.25.0

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🤖 AI code review

Routine release PR for v3.25.0. It bumps VERSION files (umbrella 3.25.0, sagemaker-core 2.25.0, train/serve/mlops 1.25.0), updates the inter-package dependency pins in the pyproject.toml files consistently, and adds the corresponding CHANGELOG entries. Version numbers and dependency constraints are consistent across all files; no issues found.

_{Reviewed commit caf8a0e. Automated review; verify before acting.}