Remove unneeded replace clause from go.mod

[mochizuki875]

Remove unneeded replace clause from go.mod.
It was added as workaround of k8s.io/kubernetes import error in #283 .
(ref. kubernetes/kubernetes#79384)

However, k8s.io/kubernetes has been removed in #286 as unneeded dependency so replace clause is unneeded too.

related: #290 (review)

[k8s-ci-robot]

Hi @mochizuki875. 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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[mochizuki875]

/assign @adrianludwin
/cc @erikgb

[erikgb]

Thanks!
/lgtm

[rjbez17]

/ok-to-test

[rjbez17]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mochizuki875, rjbez17

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