build(deps): bump golang from 1.20 to 1.21 in /testdata/project-v4

[dependabot]

Bumps golang from 1.20 to 1.21.

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[k8s-ci-robot]

Hi @dependabot[bot]. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[camilamacedo86]

Closing this one.
We need wait k8s be bumped as controller-runtime.

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