Fix Bug on Peft Config Check in AutoGPTQ Plugin

[achew010]

Description

This is a fix to address a mistake with a check on target_modules in peft_config. Target modules come in as a set and the assertion will be raised unnecessarily.

mistake:
assert isinstance(tm, (list, str)), "target modules can only be list or string"

correction:
assert isinstance(tm, (list, set, str)), "target modules can only be list, set or string"

Tested with alpaca on both all-linear and q_proj k_proj v_proj o_proj

all-linear

***** Running training *****
  Num examples = 2,754
  Num Epochs = 1
  Instantaneous batch size per device = 4
  Total train batch size (w. parallel, distributed & accumulation) = 4
  Gradient Accumulation steps = 1
  Total optimization steps = 100
  Number of trainable parameters = 41,943,040

q_proj k_proj v_proj o_proj

***** Running training *****
  Num examples = 2,754
  Num Epochs = 1
  Instantaneous batch size per device = 4
  Total train batch size (w. parallel, distributed & accumulation) = 4
  Gradient Accumulation steps = 1
  Total optimization steps = 100
  Number of trainable parameters = 13,631,488

[fabianlim]

do not bump version in this PR