Fix random time in tap-new

[SMillerDev]

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As @nandahkrishna pointed out, Random.rand does not include the max provided. So 23 can only give 22 as a max return. Upping it by one allows it to select the full day.

[Copilot]

Pull request overview

This PR fixes the random schedule time generation in brew tap-new so the generated autobump workflow can select the full 24-hour day (including hour 23) and all 5-minute blocks (including minute 55), avoiding an off-by-one limitation in Random.rand(max).

Changes:

• Adjust random hour generation from Random.rand(23) to Random.rand(24) so 23 is reachable.
• Adjust random 5-minute block generation from Random.rand(11) * 5 to Random.rand(12) * 5 so 55 is reachable.

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