chore: Fix parquet benchmark test

[colin-ho]

To be merged together with https://github.com/Eventual-Inc/daft-benchmarking/pull/66

[codspeed-hq]

CodSpeed Performance Report

Merging #3632 will improve performances by 18.26%

_{Comparing colin/fix-parquet-benchmark (d3868d3) with main (f9a89a7)}

Summary

⚡ 1 improvements
✅ 26 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	colin/fix-parquet-benchmark	Change
⚡	test_iter_rows_first_row[100 Small Files]	230.1 ms	194.5 ms	+18.26%

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.90%. Comparing base (f9a89a7) to head (d3868d3).
Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3632   +/-   ##
=======================================
  Coverage   77.90%   77.90%           
=======================================
  Files         720      720           
  Lines       88726    88726           
=======================================
+ Hits        69122    69125    +3     
+ Misses      19604    19601    -3     

see 3 files with indirect coverage changes