ci: fall back to github.token when GUSTAV_PAT is absent

[MisterWanted]

The scheduled docs run fails with "Input 'token' not supplied" because
this repo has no GUSTAV_PAT secret. release.yaml already uses the
|| github.token fallback; mirror it in panvimdoc.

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Run ID: c47715fb-ef2f-4b7d-9628-08c9fe206964

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[devin-ai-integration]

Devin Review found 1 potential issue.

[devin-ai-integration]

🟡 Auto-merge step still hard-requires the absent secret

With no GUSTAV_PAT, the PR is now created via the github.token fallback, so steps.cpr.outputs.pull-request-number is set and the auto-merge step runs. That step's GH_TOKEN still has no fallback, so it is empty and gh pr merge fails authentication, turning the run red.

(Refers to this code)

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