Regression tests failing due to numerical differences

[not-jenni]

https://github.com/iree-org/iree-samples/actions/runs/3826764148/jobs/6510806357

midas_test.py and mirnet_test.py began failing on Jan 2nd:

Max error (0): 1183.290161
[  FAILED  ] MidasTest.test_compile_tflite

Max error (0): 0.053242
[  FAILED  ] MirnetTest.test_compile_tflite

[jpienaar]

midas_test now passing at head.