Fix Lehmer64 implementation of next.
#2912
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The implementation of [`Lehmer64Rand::next`] performs a mul on `u128`, which is not checked against overflows. It leads to panic in debug mode. [`Lehmer64Rand`]: https://github.com/AFLplusplus/LibAFL/blob/fd6271fa356f3addda6db33f37db7e42a2c99bbc/libafl_bolts/src/rands/mod.rs#L373-L376
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The implementation of [
Lehmer64Rand::next] performs a mul onu128, whichis not checked against overflows. It leads to panic in debug mode.