refactor(rust): Eliminate some uses of deprecated raw_entry

[orlp]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 84.21053% with 12 lines in your changes missing coverage. Please review.

Project coverage is 79.79%. Comparing base (0cef5b7) to head (f688dae).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/polars-core/src/frame/group_by/hashing.rs	76.08%	11 Missing ⚠️
crates/polars-core/src/frame/group_by/proxy.rs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #19102      +/-   ##
==========================================
+ Coverage   79.77%   79.79%   +0.01%     
==========================================
  Files        1531     1531              
  Lines      208551   208484      -67     
  Branches     2913     2913              
==========================================
- Hits       166369   166356      -13     
+ Misses      41631    41577      -54     
  Partials      551      551              

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