fix: adjust _convert_weight_to_int4pack_cpu input weights for pytorch>=2.5 #286
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Fixes: #274
PyTorch 2.5 adjusted input weights of _convert_weight_to_int4pack_cpu from
[n][k] int32
to[n][k / 2] uint8
. Changing quanto code accordingly.See: pytorch/pytorch#129940
See: pytorch/pytorch@6f662e9
CC: @dacorvo