[quantization] Fix incorrect type annotation on Linear __setstate__

[jamesr66a]

Stack from ghstack:

• [quantization] JIT trace testing #23987 [WIP][quantization] JIT trace testing
• [quantization] equal() for QuantizedCPU #24211 [quantization] equal() for QuantizedCPU
• [quantization] test_nn_quantized -> test_quantized_nn_mods #24201 [quantization] test_nn_quantized -> test_quantized_nn_mods
• [quantization] Fix incorrect type annotation on Linear __setstate__ #24209 [quantization] Fix incorrect type annotation on Linear setstate
• [quantization] fix py2 imports in _intrinsic/modules #24206 [quantization] fix py2 imports in _intrinsic/modules

Differential Revision: D16777886

[jianyuh]

LGTM!

[facebook-github-bot]

@jamesr66a merged this pull request in 7923884.