Update kubekins-e2e image for cluster-api-provider-aws

[sedefsavas]

This PR updates the kubekins-e2e version from 1.18 to 1.19, which uses go v1.15.x.

/hold
until we are close to merge kubernetes-sigs/cluster-api-provider-aws#2121

cc @randomvariable

[k8s-ci-robot]

Hi @sedefsavas. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: sedefsavas
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[k8s-ci-robot]

@sedefsavas: PR needs rebase.

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[sedefsavas]

Combined this PR with another open PR:
#20463