chore!: upgrade pyarrow pin to >=8.0.0

[jaychia]

Updates the lower bound of pyarrow to pyarrow>=8.0.0.

This allows us to flatten some code checks.

However, it turns out that our tests aren't being properly skipped -- I had to update the tests to just skip based on our lower bound (skip if version < 9.0.0) which very loose, but otherwise searching for the individual versions for each suite of tests was quite difficult.

[codspeed-hq]

CodSpeed Performance Report

Merging #3612 will improve performances by 78.67%

_{Comparing jay/pyarrow-8 (901e32b) with main (063de4d)}

Summary

⚡ 1 improvements
✅ 26 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	jay/pyarrow-8	Change
⚡	test_iter_rows_first_row[100 Small Files]	304.4 ms	170.4 ms	+78.67%

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.23%. Comparing base (5e40837) to head (901e32b).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3612      +/-   ##
==========================================
- Coverage   77.81%   77.23%   -0.58%     
==========================================
  Files         718      717       -1     
  Lines       88249    88791     +542     
==========================================
- Hits        68667    68580      -87     
- Misses      19582    20211     +629     

Files with missing lines	Coverage Δ
daft/table/table_io.py	86.47% <100.00%> (-0.17%)	⬇️

... and 27 files with indirect coverage changes