Enable strings in guess_dynamic_shapes

[xadupre]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 72.22%. Comparing base (750b6dd) to head (e46d35c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
onnx_diagnostic/export/dynamic_shapes.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #91   +/-   ##
=======================================
  Coverage   72.22%   72.22%           
=======================================
  Files          81       81           
  Lines        7466     7466           
=======================================
  Hits         5392     5392           
  Misses       2074     2074           

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