Investigate and fix CI issues

[justinchuby]

_____________________ TestFuseXformers.test_fuse_xformers _____________________
[gw3] win32 -- Python 3.11.9 D:\a\onnxscript\onnxscript.nox\test_onnx_weekly\Scripts\python.EXE
onnxscript\rewriter\ort_fusions\fuse_xformers_test.py:35: in test_fuse_xformers
new_outputs = ort_run("optimized", model, inputs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
onnxscript\rewriter\ort_fusions_test_utils.py:19: in ort_run
model_proto.SerializeToString(), options, providers=providers
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
E google.protobuf.message.EncodeError: Failed to serialize proto