Fix(polars) update drop method for compatibility

[alsmith151]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.73%. Comparing base (bfbef27) to head (0945245).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #300   +/-   ##
=======================================
  Coverage   68.73%   68.73%           
=======================================
  Files          37       37           
  Lines        3205     3205           
=======================================
  Hits         2203     2203           
  Misses       1002     1002           

Files with missing lines	Coverage Δ
capcruncher/cli/genome_digest.py	90.47% <ø> (ø)

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