chore(deps): update terraform cloudposse/iam-role/aws to v0.21.0 #68

Job	Run time
terraform-module / CI / Labels Validate	2s
terraform-module / Readme	0s
terraform-module / CI / Validate Codeowners (syntax)	3s
terraform-module / CI / Validate Codeowners (owners)	0s
terraform-module / CI / bats	37s
terraform-module / CI / Format HCL	28s
terraform-module / CI / Find modules	2s
terraform-module / CI / Lint (.)	12s
terraform-module / CI / Lint (./examples/cis)	17s
terraform-module / CI / Lint (./examples/complete)	23s
terraform-module / CI / Lint (./examples/hipaa)	15s
terraform-module / CI / Lint (./modules/cis-1-2-rules)	13s
terraform-module / CI / Lint (./modules/conformance-pack)	17s
terraform-module / ci	1s
terraform-module / Release	0s
	2m 50s

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