fix: allow auth_token_update_strategy=DELETE to migrate AUTH to RBAC/ACL #203

Job	Run time
terraform-module / CI / bats	32s
terraform-module / CI / Labels Validate	3s
terraform-module / CI / Validate Codeowners (owners)	44s
terraform-module / CI / Format HCL	21s
terraform-module / CI / Validate Codeowners (syntax)	8s
terraform-module / CI / Find modules	4s
terraform-module / Readme	-1s
terraform-module / CI / Lint (./examples/serverless)	25s
terraform-module / CI / Lint (./examples/complete)	28s
terraform-module / CI / Lint (.)	19s
terraform-module / ci	4s
terraform-module / Release	-1s
	3m 6s

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