aws_util: fix leading zeros in time_key

Fixes #7538

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This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 10 days.

ping @PettitWesley

This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 10 days.

fixed in #9128