chore: fix typo in variables.tf #6219

Job	Run time
Verify module (latest)	22s
Verify examples (1.5.6, termination-watcher)	31s
Verify examples (1.5.6, ephemeral)	38s
Verify examples (latest, default)	28s
Verify examples (1.5.6, prebuilt)	31s
Verify examples (latest, ephemeral)	26s
Verify examples (latest, prebuilt)	22s
Verify examples (1.5.6, default)	32s
Verify examples (latest, external-managed-ssm-secrets)	25s
Verify examples (latest, termination-watcher)	18s
Verify examples (latest, multi-runner)	24s
Verify examples (1.5.6, multi-runner)	31s
Verify modules (1.5.6, lambda)	21s
Verify modules (1.5.6, ami-housekeeper)	21s
Verify module (1.5.6)	28s
Verify modules (1.5.6, runners)	22s
Verify modules (1.5.6, termination-watcher)	20s
Verify modules (1.5.6, multi-runner)	21s
Verify modules (1.5.6, runner-binaries-syncer)	18s
Verify modules (latest, download-lambda)	17s
Verify modules (1.5.6, setup-iam-permissions)	20s
Verify modules (latest, ami-housekeeper)	22s
Verify modules (1.5.6, download-lambda)	22s
Verify modules (latest, runner-binaries-syncer)	19s
Verify modules (latest, setup-iam-permissions)	16s
Verify modules (latest, ssm)	17s
Verify modules (1.5.6, webhook)	23s
Verify modules (1.5.6, ssm)	21s
Verify modules (latest, termination-watcher)	16s
Verify modules (latest, lambda)	20s
Verify modules (latest, multi-runner)	22s
Verify modules (latest, webhook)	20s
Verify modules (latest, runners)	16s
Verify examples (1.5.6, external-managed-ssm-secrets)	31s
	13m 1s

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