ci: fix benchmarks

[flying-sheep]

Looks like setup() only reliably runs after setup_cache if there are parameters.

So I’m returning something from setup_cache to introduce a “parameter”.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.60%. Comparing base (d5a745e) to head (5ae983e).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4190      +/-   ##
==========================================
- Coverage   79.74%   79.60%   -0.15%     
==========================================
  Files         120      120              
  Lines       12852    12852              
==========================================
- Hits        10249    10231      -18     
- Misses       2603     2621      +18     

Flag	Coverage Δ
hatch-test.low-vers	?
hatch-test.pre	79.60% <ø> (-0.01%)	⬇️

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see 6 files with indirect coverage changes

[scverse-benchmark]

No changes in benchmarks.

Comparison: https://github.com/scverse/scanpy/compare/d5a745e1258f5ca6a23c6a790f27b40d7ad05418..5ddbf61e1169b09720cf08411f13e03c6733b7ad
Last changed: Tue, 30 Jun 2026 13:15:34 +0000

More details: https://github.com/scverse/scanpy/pull/4190/checks?check_run_id=84281810960