fix: Cast to BinView before filtering Utf8View

[coastalwhite]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.

Project coverage is 79.27%. Comparing base (966f76f) to head (773392b).
Report is 30 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-compute/src/filter/mod.rs	0.00%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #21106      +/-   ##
==========================================
- Coverage   79.27%   79.27%   -0.01%     
==========================================
  Files        1588     1588              
  Lines      226122   226136      +14     
  Branches     2593     2593              
==========================================
+ Hits       179267   179271       +4     
- Misses      46259    46269      +10     
  Partials      596      596              

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