Fix release workflow: persist credentials for git-auto-commit-action

[adamtheturtle]

The release workflow was failing because persist-credentials: false on the checkout step removed authentication, causing stefanzweifel/git-auto-commit-action to fail when pushing the changelog bump commit.

This changes persist-credentials to true with a zizmor: ignore[artipacked] suppression comment, since persisted credentials are required for the auto-commit action to push.

Fixes the failure at https://github.com/VWS-Python/vws-python-mock/actions/runs/22032444453/job/63659742813

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Note

Low Risk
Workflow-only change that just adjusts GitHub checkout credential persistence; low blast radius but affects release automation behavior.

Overview
Fixes the release GitHub Actions workflow by switching actions/checkout to persist-credentials: true so stefanzweifel/git-auto-commit-action can push the changelog bump commit.

Adds a short inline comment and a zizmor suppression annotation documenting why persisted credentials are required.

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