tools: address archived dependency github.com/pkg/errors

[pjsharath28]

Removes archived dependency github.com/pkg/errors.

Verified via go mod tidy and go mod why -m github.com/pkg/errors
that the module is no longer required.

Part of etcd-io/etcd#21270

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @pjsharath28. Thanks for your PR.

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