Update vendored dependencies from v28.2 to v28.4

[cezarygerard]

Updated dependencies from v28.2 to v28.4
then I have run:

• Update library to the desired version.
  ginko-test-package-version.env, go.mod, providers/go.mod, crd/go.mod and crd/hack/go.mod describe the required libraries. Update the version of each dependency to the desired Kubernetes release version. Run go mod tidy after update. First in crd/hack, then in crd and /providers, then in a root path.
  Run tools/update_vendor.sh

• In WORKSPACE, update fetch_kube_release sha and version to the desired release version.
  Note: The current Kubernetes release is using sha512 hash while cloud-provider-gcp is using sha256. Re-sha with command sha256sum if needed. Use export KUBE_VERSION=v1.X.Y; tools/sha256_generator.sh to generate values automatically.

• Update KUBE_GIT_VERSION in

  cloud-provider-gcp/tools/version.sh

  Line 77 in 9f5cdad

  if [[ -n ${KUBE_GIT_VERSION-} ]] || KUBE_GIT_VERSION=$(echo "v1.18.0-alpha+${KUBE_GIT_COMMIT}"); then

  with the right tag.

[k8s-ci-robot]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: cezarygerard
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[jprzychodzen]

Could you follow process from https://github.com/kubernetes/cloud-provider-gcp/blob/master/docs/instruction-how-to-bump-repository.md ?

[cezarygerard]

/retest

[cezarygerard]

/hold

[code-elinka]

/test all

[k8s-ci-robot]

@cezarygerard: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
cloud-provider-gcp-verify-crds	736cdbf	link	true	/test cloud-provider-gcp-verify-crds

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.