UID2-6742: upgrade actions/checkout to v6 (Node.js 24)#1016

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sophia-chen-ttd wants to merge 6 commits intomainfrom

sch-UID2-6742-update-node20-actions

Commits on May 4, 2026

chore(UID2-6742): upgrade Node.js 20 actions to Node.js 24-compatible versions
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Commits on May 5, 2026

chore(UID2-6742): upgrade Node.js 20 actions to Node.js 24-compatible versions
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chore(UID2-6742): SHA-pin bare action tag references
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Commits on May 6, 2026

Commits on May 7, 2026

revert(UID2-6742): restore @v3 refs (remove CI test redirects)
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