Enforce upper bound for unlock_time

[alanmcanonical]

Description:

• Enforce upper bound for unlock_time for Ubuntu2404

Rationale:

• The unlock_time check only enforces a lower bound (>= 0), so it passes for ANY unlock_time value, while the STIG requires exactly 0

[openshift-ci]

Hi @alanmcanonical. Thanks for your PR.

I'm waiting for a ComplianceAsCode member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

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