fix: Raise on categorical search_sorted

[ritchie46]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.95%. Comparing base (dbd2c5f) to head (b3dbb90).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-ops/src/series/ops/search_sorted.rs	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #20395      +/-   ##
==========================================
- Coverage   78.95%   78.95%   -0.01%     
==========================================
  Files        1561     1561              
  Lines      219881   219886       +5     
  Branches     2471     2471              
==========================================
+ Hits       173614   173615       +1     
- Misses      45699    45703       +4     
  Partials      568      568              

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