fix: replace PR_BOT_GH_PAT with FERN_GITHUB_TOKEN in update-versions workflow

[davidkonigsberg]

Summary

Replaces PR_BOT_GH_PAT with FERN_GITHUB_TOKEN in the "Approving PR" step of the update-versions.yml workflow. This aligns the docs repo with the standardized token used across other fern-api repos (venus, fern, fern-platform).

The PR_BOT_GH_PAT token was found to lack the required scopes (e.g. security_events) in other repos, causing CI failures. FERN_GITHUB_TOKEN is the canonical PAT with the correct permissions.

Review & Testing Checklist for Human

• Verify that the FERN_GITHUB_TOKEN secret is configured in the fern-api/docs repo (Settings → Secrets and variables → Actions). If it's missing, the auto-approve step will fail.
• After merging, monitor the next automated "Update versions from docker hub" PR to confirm the approval step succeeds.

Notes

• Also fixes a missing trailing newline at end of file.
• Related PRs: similar changes in fern-api/venus, fern-api/fern, and fern-api/fern-platform.

Link to Devin session: https://app.devin.ai/sessions/facba5dbb3fb4869a94c949db5085817
Requested by: @davidkonigsberg

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