fix: Make default tag `terraform-aws-modules` optional #830

Job	Run time
Collect workflow inputs	3s
Max TF pre-commit	1m 51s
Min TF pre-commit (.)	24s
Min TF pre-commit (./examples/simple-cicd)	22s
Min TF pre-commit (./examples/complete)	28s
Min TF pre-commit (./examples/with-efs)	23s
Min TF pre-commit (./examples/simple)	23s
Min TF pre-commit (./examples/container-image)	24s
Min TF pre-commit (./examples/deploy)	1s
Min TF pre-commit (./examples/alias)	26s
Min TF pre-commit (./examples/with-vpc)	27s
Min TF pre-commit (./examples/code-signing)	24s
Min TF pre-commit (./examples/with-vpc-s3-endpoint)	28s
Min TF pre-commit (./examples/multiple-regions)	26s
Min TF pre-commit (./examples/triggers)	27s
Min TF pre-commit (./examples/build-package)	26s
Min TF pre-commit (./examples/event-source-mapping)	22s
Min TF pre-commit (./examples/async)	21s
Min TF pre-commit (./examples/runtimes)	22s
Min TF pre-commit (./modules/docker-build)	1s
Min TF pre-commit (./modules/deploy)	1s
Min TF pre-commit (./modules/alias)	24s
	8m 54s

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