fix(ci): retain release git credentials

[robjtede]

Keeps checkout credentials available for the release job so x52-bump-changelogs can check out and push the release PR.

The job already has scoped contents: write and pull-requests: write permissions.

Validation: zizmor v1.29.0 offline scan with no findings.

Summary by CodeRabbit

• Chores
  • Updated the release process to retain checkout credentials during workflow execution.

[coderabbitai]

📝 Walkthrough

Walkthrough

The release workflow now preserves checkout credentials after the checkout step.

Changes

Release workflow

Layer / File(s)	Summary
Preserve checkout credentials .github/workflows/release.yml	The checkout step changes persist-credentials from false to true.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• x52dev/contracts#146: This PR changes checkout credential persistence in ci.yml in the opposite direction.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the CI change that retains Git credentials for release operations.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/release-git-auth

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