ci: upgrade actions/checkout from v2 to v6 in knative-downstream workflow#8988

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Ankitsinghsisodya wants to merge 2 commits intoknative:mainfrom

Ankitsinghsisodya:fix/checkout-v4

Commits on Apr 1, 2026

ci: upgrade actions/checkout from v2 to v4 in knative-downstream workflow
Ankitsinghsisodya
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Commits on Apr 15, 2026

ci: update actions/checkout to v6 in knative-downstream workflow
Ankitsinghsisodya
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