fix: fix numpy arrays in repr

[tlambert03]

closes #206

[codecov]

Codecov Report

Attention: Patch coverage is 95.83333% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.09%. Comparing base (70b32dd) to head (f9d6c09).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/useq/_base_model.py	94.11%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #207      +/-   ##
==========================================
- Coverage   94.10%   94.09%   -0.01%     
==========================================
  Files          22       22              
  Lines        1458     1473      +15     
==========================================
+ Hits         1372     1386      +14     
- Misses         86       87       +1     

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