build: update checkout action to v5

[rejected-l]

GitHub-hosted runners now use Node 24, so actions/checkout@v5 is required. Minimum runner version v2.327.1. Workflows only updated—no functional changes.

See: https://github.com/actions/checkout/releases/tag/v5.0.0

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Latest commit: 9c6c61b

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Project	Deployment	Preview	Comments	Updated (UTC)
miniapps-docs	✅ Ready	Preview	Comment	Aug 13, 2025 4:57am