Terraform: fix options field, should be spot_options

[kimxogus]

fixes #6986

[k8s-ci-robot]

Hi @kimxogus. Thanks for your PR.

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[justinsb]

Thanks @kimxogus

/ok-to-test
/lgtm
/approve

Will mark for cherry-picking

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: justinsb, kimxogus

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