ci: fix for code scanning alert no. 4: Workflow does not contain permissions

[VisualBean]

Potential fix for https://github.com/ByteBardOrg/AsyncAPI.NET/security/code-scanning/4

Add an explicit permissions block at the workflow level (right after on: block and before jobs:) to enforce least privilege for all jobs in this workflow.

Best minimal permissions for current behavior:

• contents: read (safe baseline, common for actions metadata/repo reads)
• pull-requests: write (required for creating/updating/deleting sticky PR comments)

This preserves existing functionality (linting PR title + posting/removing PR comment) while preventing broader default token scopes from being used.

Suggested fixes powered by Copilot Autofix. Review carefully before merging.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 60f470b8-ffe7-45aa-b10b-3869401e450c

📥 Commits

Reviewing files that changed from the base of the PR and between 723a99d and 6fbaff8.

📒 Files selected for processing (1)

• .github/workflows/pr-title-lint.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch alert-autofix-5

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