chore: fix run-ci-for-external-forks workflow not triggering CI

[edmundhung]

Fixes #12136.

I ran the workflow for #12064 but notice the CI didn't trigger on #12136. End up fixing it by manually pushing an empty commit, so this PR does the same automatically.

Not entirely sure why the original amend approach didn't work. It might be GITHUB_TOKEN not triggering workflows, or some timing issue with the branch push happening before the PR exists.

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• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because:

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Latest commit: 27b0570

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[pkg-pr-new]

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@cloudflare/kv-asset-handler

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wrangler

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commit: 27b0570

[devin-ai-integration]

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