python fix arr.contains type

[ritchie46]

fixes #3777

[codecov-commenter]

Codecov Report

Merging #3782 (efc366b) into master (bdb1dd0) will increase coverage by 0.82%.
The diff coverage is 92.08%.

@@            Coverage Diff             @@
##           master    #3782      +/-   ##
==========================================
+ Coverage   63.01%   63.84%   +0.82%     
==========================================
  Files         439      440       +1     
  Lines       71853    71278     -575     
==========================================
+ Hits        45280    45509     +229     
+ Misses      26573    25769     -804     

Impacted Files	Coverage Δ
polars/polars-lazy/src/dummies.rs	0.00% <0.00%> (ø)
polars/polars-lazy/src/logical_plan/aexpr.rs	79.51% <ø> (ø)
polars/polars-lazy/src/logical_plan/alp.rs	77.14% <ø> (-0.20%)	⬇️
polars/polars-lazy/src/logical_plan/mod.rs	90.90% <ø> (ø)
...lars/polars-lazy/src/logical_plan/optimizer/mod.rs	100.00% <ø> (ø)
...src/physical_plan/executors/groupby_partitioned.rs	80.92% <ø> (-0.10%)	⬇️
...ars/polars-lazy/src/physical_plan/executors/mod.rs	90.84% <ø> (ø)
...polars-lazy/src/physical_plan/expressions/apply.rs	93.41% <ø> (ø)
polars/polars-lazy/src/physical_plan/mod.rs	60.00% <ø> (ø)
polars/polars-lazy/src/physical_plan/planner/lp.rs	82.32% <ø> (ø)
... and 50 more

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