TF1 CI Unit Test Failure

[TobyRoseman]

One TensorFlow 1.X unit test that has been consistently failing on our CI: coremltools/converters/mil/frontend/tensorflow/test/test_ops.py::TestSliceByIndex::test_slice_by_index[[use_cpu_only=False]-mlprogram-fp16-[rank=1]-[masking=True]]

Logs: https://gitlab.com/zach_nation/coremltools/-/jobs/2254707322

Looking at when this started to failure, it doesn't seem related to any change we've made. I also can not reproduce the issue locally.

[TobyRoseman]

The CI system has been rebuilt. It is currently passing.