ls: Use rustc-hash at colors

[oech3]

No description provided.

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/tail/inotify-dir-recreate (passes in this run but fails in the 'main' branch)

[sylvestre]

some jobs are failing

[codspeed-hq]

CodSpeed Performance Report

Merging this PR will not alter performance

_{Comparing oech3:lscolh (5560106) with main (26a29ca)}

Summary

✅ 284 untouched benchmarks
⏩ 38 skipped benchmarks¹

Footnotes

1. 38 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[oech3]

Really 0% perf change. Just for binary size.