fix: wrap errors returned by JSON unmarshal

[ThatsMrTalbot]

Currently %v is used inside an Errorf call, this means the original errors is lost and cannot be unwrapped to.

By changing it to %w the error is preserved and can be retrieved with errors.As.

[k8s-ci-robot]

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[neolit123]

thanks
/lgtm

i don't see other %v left in yaml.go.

[ThatsMrTalbot]

The build errors seem unrelated, may need to retry the jobs