[libcxx-commits] [libcxx] [libc++] Adjust some of the [rand.dist] critical values that are too strict (PR #88669)

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EricWF wrote:

Is in not better to have smaller values on this?

If so, we may want to keep some testing to ensure our implementation doesn't slip?
But otherwise, this change seems reasonable. 

https://github.com/llvm/llvm-project/pull/88669