update onnx quantized model files. use 15.0 version

onnx/decoder_model_merged.onnx

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:4a26eb0e2e6161c55b0d0da4ad6ff9eaff926713f69cc75812809ab7d84187da
+oid sha256:bd347bdfd8d39c88b7f84c2dca5b4d41100e726396822a38fdb8a7eb2009ba4a
 size 651113037

onnx/decoder_model_merged_quantized.onnx

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:5abef41be38f93918c35c52aa353074f2c78b9aaae21c7beb11ab00cc01ab8a8
-size 164560432
+oid sha256:62215ed475944510a2a8be17643c5c94c23120dfa5d499195c59f15e6b847168
+size 164560287

onnx/decoder_with_past_model_quantized.onnx

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:14fdd2faa93569152c9e3e639043d35894bfdd7ef6ee9284ec8bdfa2e04b3c5c
-size 149733674
+oid sha256:33f7b6d5a10e4f8c4eb24a51522a9defd6bfb076e15ad134d1a2b3d6efbe9360
+size 149733536