Fix cluster-autoscaler clusterapi sample manifest

[hidekazuna]

This PR fixes sample manifest of cluster-autoscaler clusterapi provider.

Fixes: #3804

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[hidekazuna]

/cc @benmoss

[benmoss]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hardikdr, hidekazuna

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