fix: Make default tag `terraform-aws-modules` optional #832

Job	Run time
Collect workflow inputs	2s
Max TF pre-commit	1m 51s
Min TF pre-commit (.)	23s
Min TF pre-commit (./examples/simple-cicd)	24s
Min TF pre-commit (./examples/complete)	28s
Min TF pre-commit (./examples/with-efs)	23s
Min TF pre-commit (./examples/simple)	24s
Min TF pre-commit (./examples/container-image)	23s
Min TF pre-commit (./examples/deploy)	22s
Min TF pre-commit (./examples/alias)	22s
Min TF pre-commit (./examples/with-vpc)	27s
Min TF pre-commit (./examples/code-signing)	22s
Min TF pre-commit (./examples/with-vpc-s3-endpoint)	24s
Min TF pre-commit (./examples/multiple-regions)	26s
Min TF pre-commit (./examples/triggers)	22s
Min TF pre-commit (./examples/build-package)	28s
Min TF pre-commit (./examples/event-source-mapping)	23s
Min TF pre-commit (./examples/async)	23s
Min TF pre-commit (./examples/runtimes)	22s
Min TF pre-commit (./modules/docker-build)	21s
Min TF pre-commit (./modules/deploy)	27s
Min TF pre-commit (./modules/alias)	22s
	9m 49s

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