Update tutorial to avoid use of copy.deepcopy()- FX Graph Mode

[sekyondaMeta]

Update the FX Graph Mode Post Training Static Quantization tutorial to avoid the use of copy.deepcopy().
Tutorial link:

tutorials/prototype_source/fx_graph_mode_ptq_static.rst

Line 218 in 6ae56a1

model_to_quantize = copy.deepcopy(float_model)

See issue #2177 for more information

[mikebrow]

/assigntome

[QasimKhan5x]

/assigntome