fix: Correct dart-lang/setup-dart SHA pin

[rmi22186]

Sha fix - using https://github.com/dart-lang/setup-dart/releases/tag/v1.7.2 now which is 65eb853c7ba17dde3be364c3d2858773e7144260

[cursor]

PR Summary

Low Risk
Low risk: this only updates the pinned GitHub Action SHA used to install the Dart SDK during the release workflow, with no product code changes.

Overview
Fixes the Release – Publish GitHub Actions workflow by correcting the pinned commit SHA for dart-lang/setup-dart (now v1.7.2) during the Dart SDK setup step.

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