fix: reserved instances restrictions #183

Job	Run time
terraform-module / CI / Format HCL	15s
terraform-module / CI / bats	39s
terraform-module / CI / Find modules	3s
terraform-module / Readme	0s
terraform-module / CI / Validate Codeowners (syntax)	4s
terraform-module / CI / Validate Codeowners (owners)	0s
terraform-module / CI / Labels Validate	2s
terraform-module / CI / Lint (.)	18s
terraform-module / CI / Lint (./examples/basic)	12s
terraform-module / CI / Lint (./examples/complete)	19s
terraform-module / CI / Lint (./examples/enhanced_monitoring)	13s
terraform-module / CI / Lint (./examples/postgres)	18s
terraform-module / CI / Lint (./examples/serverless_mysql)	18s
terraform-module / CI / Lint (./examples/serverless_mysql57)	11s
terraform-module / CI / Lint (./examples/serverlessv2_postgres)	19s
terraform-module / CI / Lint (./examples/with_cluster_parameters)	13s
terraform-module / ci	1s
terraform-module / Release	0s
	3m 25s

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