fix: relax sympy version

[inisis]

Related to NVIDIA/TensorRT-Model-Optimizer#478

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.52%. Comparing base (3e32e5c) to head (1b9875b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #224   +/-   ##
=======================================
  Coverage   90.52%   90.52%           
=======================================
  Files          42       42           
  Lines        3704     3704           
=======================================
  Hits         3353     3353           
  Misses        351      351           

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