PERF: more realistic np datetime c benchmark

[dontgoto]

See my comments in #57951. This change in the benchmark input range has more coverage of the different logic branches in np_datetime.c. The benchmark should run about 1.8x as long (most likely a little bit machine dependent) after merging this.

Keeping this separate from my other PR #57988 that improves the np_datetime.cperformance to distinguish the benchmark impacts.

@WillAyd

[github-actions[bot]]

This pull request is stale because it has been open for thirty days with no activity. Please update and respond to this comment if you're still interested in working on this.

[mroeschke]

Thanks @dontgoto