Skip bot incomplete PR closures

[MikeMcQuaid]

Avoid closing Dependabot/BrewTestBot automation PRs that won't use the template (and that's fine)

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• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them? Performance claims (e.g. "this is faster") must include Hyperfine benchmarks.
• Have you written new tests (excluding integration tests) for your changes? Here's an example.
• Have you successfully run brew lgtm (style, typechecking and tests) with your changes locally?

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• AI was used to generate or assist with generating this PR. Please specify below how you used AI to help you, and what steps you have taken to manually verify the changes. Non-maintainers may only have one AI-assisted/generated PR open at a time.

OpenAI Codex 5.5 xhigh with local tweaking and review.

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[Copilot]

Pull request overview

This PR updates the “incomplete PRs” GitHub Actions workflow to avoid automatically commenting/closing automation-created pull requests that don’t (and shouldn’t be expected to) follow the standard PR template.

Changes:

• Add job-level conditions to skip running the workflow when the PR author is BrewTestBot or dependabot[bot].

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