feat(github-bot): config improvements

[thehowl]

• change the "docs" merge requirements to allow also for a third-party contribution approved by both core+devrel
• disallow merging on all prs with the "don't merge" label
• don't require additional information on dependabot PRs

[Gno2D2]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
contribs/github-bot/internal/config/config.go	0.00%	15 Missing ⚠️

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