fix: Properly implement AnyValue::Binary into_py

[coastalwhite]

Fixes #18953.

[codecov]

Codecov Report

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

Project coverage is 79.84%. Comparing base (a7845c4) to head (aa18b8c).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-python/src/conversion/any_value.rs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #18960   +/-   ##
=======================================
  Coverage   79.83%   79.84%           
=======================================
  Files        1522     1523    +1     
  Lines      207264   207297   +33     
  Branches     2906     2906           
=======================================
+ Hits       165479   165518   +39     
+ Misses      41237    41231    -6     
  Partials      548      548           

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