pause: remove obsolete Windows buildx workaround

[neersighted]

What type of PR is this?

/kind cleanup
/sig node

What this PR does / why we need it:

The issue this workaround set out to address has been resolved in buildx for some time (since v0.8.0); there is no longer a need to preserve it.

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

• Upstream Issue

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: neersighted / name: Bjorn Neergaard (d72ed3257567a56b2d704373949b83625c479b62)

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[k8s-ci-robot]

Hi @neersighted. Thanks for your PR.

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[sftim]

Seems reasonable
/ok-to-test

[bart0sh]

/sig windows

[jsturtevant]

/assign @claudiubelu

[bart0sh]

/triage accepted
/priority important-longterm
/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: d20cd5156e105038f96d60bda4588c416b4d85b0

[claudiubelu]

Let's see. According to the latest pause image build logs [1], the image being used for building is gcr.io/k8s-staging-test-infra/gcb-docker-gcloud:v20221007-69e0da97ef, which was published in 2022-10-07. This means that buildx-v0.8.0.linux-amd64 is used [2], as well as the moby/buildkit:buildx-stable-1 image which was updated recently. The issue was solved and tagged in [v0.8.0-rc1](https://github.com/moby/buildkit/releases/tag/v0.8.0-rc1), which means that this PR is safe.

[1] https://storage.googleapis.com/kubernetes-jenkins/logs/post-kubernetes-push-image-pause/1601578642712825856/build-log.txt
[2] https://github.com/kubernetes/test-infra/blob/ad65926f6bffc6ce858bc1aa8ba0fc775825b651/images/gcb-docker-gcloud/Dockerfile#L48
[3] moby/buildkit#1747

/lgtm

[dims]

/approve

thanks @claudiubelu

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dims, neersighted

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