[torchlib] Fix layer norm dtype (#2100) #8854

Job	Run time
test (ubuntu-latest, py312)	18m 40s
test (ubuntu-latest, py311)	15m 9s
build_docs (ubuntu-latest)	2m 35s
test (ubuntu-latest, py311-torch-nightly)	16m 32s
build_docs (windows-latest)	6m 23s
test (ubuntu-latest, py311-onnx-weekly)	15m 45s
test (ubuntu-latest, py311-ort-nightly)	3m 22s
update_readme	4s
test (ubuntu-latest, py310)	2m 44s
test (windows-latest, py312)	3m 56s
test (windows-latest, py311)	3m 47s
test (windows-latest, py311-torch-nightly)	3m 35s
test (windows-latest, py311-onnx-weekly)	4m 7s
test (windows-latest, py311-ort-nightly)	3m 38s
test (windows-latest, py310)	3m 51s
test (macos-latest, py312)	8m 32s
test (macos-latest, py311)	7m 39s
test (macos-latest, py311-torch-nightly)	7m 25s
test (macos-latest, py311-onnx-weekly)	7m 51s
test (macos-latest, py311-ort-nightly)	7m 51s
test (macos-latest, py310)	17m 39s
	2h 41m 5s

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