chore: dismiss Dependabot review requests

[Pigbibi]

What changed

• dismiss Pigbibi review requests automatically generated for Dependabot PRs
• recognize both dependabot[bot] and app/dependabot identities
• distinguish automatic requests by requiring the review-request actor to be Dependabot
• preserve review requests made by maintainers
• use pull_request_target with metadata-only GitHub API access and no checkout
• retain existing CODEOWNERS behavior for all non-Dependabot PRs

Why

These repositories already auto-merge eligible non-major Dependabot updates after CI, but the global CODEOWNERS entry still creates redundant review requests and notifications. GitHub timeline events identify automatic CODEOWNERS requests with Dependabot as the actor, allowing the workflow to remove only those requests without touching later manual review requests.

Validation

• verified automatic CODEOWNERS timeline actor on a historical Dependabot PR
• verified minimal permissions: contents read and pull-requests write
• verified both supported Dependabot identities
• verified requested reviewer and request actor conditions
• separated GitHub API failure handling from the no-match path
• verified no checkout or execution of PR code
• bash syntax check
• git diff --check

[github-actions]

🤖 Codex PR Review

✅ Merge allowed: No issues found

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