Fix `squeezebert` models to use unsigned weights

quantized/squeezebert/squeezebert-mnli/default/model.onnx

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:68f8dc574d01085a8d55af7a489f546ea11c53139dd55ae338a50356eafd18e6
-size 51263203
+oid sha256:202f26053d9611dd86f847386c9b4fa7e05b2f3c7b6a5cbb1bb9e847143017da
+size 51263201

quantized/squeezebert/squeezebert-mnli/sequence-classification/model.onnx

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:7c718486840c24727386592193fbe1b1ce2e005e3d683aa20d359f06c053408b
-size 51953569
+oid sha256:75a77dcf21f4dc3f3130390acb3ee43738ce7fb6ff21063698c4ddadbfac866e
+size 51953567

quantized/squeezebert/squeezebert-uncased/default/model.onnx

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:5c871cf6960e45972dd07ba0f4207511eb207a2a784450286672dcdcfd269012
-size 51248353
+oid sha256:8e283ec763cb96d033beb4a1161e1cfec5c773760118d51daec83647f9c9818b
+size 51248351

quantized/squeezebert/squeezebert-uncased/masked-lm/model.onnx

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:9fe752dba0912d95db553b11e965de9caa2018d30e3faaa39ce78845a4cad6b1
-size 75667930
+oid sha256:59454461d81f33a926e3456aa5b9bd1f98f8849b72b92501cc0bc03dc60e17bd
+size 75667928