fix(ci): use PAT_TOKEN for README update to bypass branch protection

[AndyMik90]

Summary

The update-readme job in the release workflow was using GITHUB_TOKEN which cannot bypass branch protection rules on main. This caused the README update to fail after releases.

Changes

• Switch from GITHUB_TOKEN to PAT_TOKEN for the checkout step in update-readme job
• The PAT has permissions to bypass branch protection rules

Test Plan

• Next release should automatically update README without failing

🤖 Generated with Claude Code

[gemini-code-assist]

Note

Gemini is unable to generate a summary for this pull request due to the file types involved not being currently supported.

[coderabbitai]

Important

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🗂️ Base branches to auto review (3)

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[AndyMik90]

Closing - this fix will be included when develop is merged to main for the 2.7.6 release.