fix: Properly slice validity mask on pl.Object series

[orlp]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #18631 will improve performances by 28.27%

_{Comparing orlp:object-validity-slice (ea72809) with main (4d176e0)}

Summary

⚡ 1 improvements
✅ 38 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	orlp:object-validity-slice	Change
⚡	test_pdsh_q4	5.6 ms	4.4 ms	+28.27%

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.93%. Comparing base (253057a) to head (ea72809).
Report is 53 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18631      +/-   ##
==========================================
+ Coverage   79.91%   79.93%   +0.01%     
==========================================
  Files        1506     1506              
  Lines      203047   203057      +10     
  Branches     2889     2891       +2     
==========================================
+ Hits       162271   162313      +42     
+ Misses      40226    40194      -32     
  Partials      550      550              

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