Update kubekins e2e image with go version 1.21

[ppc64le-cloud-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Amulyam24, mkumatag

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[ppc64le-cloud-bot]

@Amulyam24: Updated the job-config configmap in namespace prow at cluster default using the following files:

• key test-e2e-capi-ibmcloud-periodics.yaml using file config/jobs/periodic/cluster-api-provider-ibmcloud/test-e2e-capi-ibmcloud-periodics.yaml

In response to [this](https://github.com/ppc64le-cloud/test-infra/pull/450): > Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.