du: Use rustc-hash for du -a / performance

[oech3]

No description provided.

[codspeed-hq]

Merging this PR will improve performance by 24.89%

⚡ 5 improved benchmarks
✅ 279 untouched benchmarks
⏩ 38 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	du_wide_tree[(5000, 500)]	12.3 ms	9.9 ms	+24.89%
⚡	Simulation	du_deep_tree[(100, 3)]	1.4 ms	1.2 ms	+8.57%
⚡	Simulation	du_max_depth_balanced_tree[(6, 4, 10)]	32.4 ms	27.5 ms	+17.82%
⚡	Simulation	du_all_wide_tree[(5000, 500)]	19.1 ms	16.7 ms	+14.53%
⚡	Simulation	du_summarize_balanced_tree[(5, 4, 10)]	8.3 ms	7.1 ms	+16.62%

---

_{Comparing oech3:du-hash (9926073) with main (1ea01a3)²}

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. ↩

2. No successful run was found on main (a3eab5c) during the generation of this report, so 1ea01a3 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[oech3]

If someone du many files on unreliable network, we should fallback to crypto-algo. But I don't think that it is needed
(but we already have blake3 dep at cksum).

[github-actions]

GNU testsuite comparison:

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

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/shuf/shuf-reservoir (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/sort/sort-stale-thread-mem (fails in this run but passes in the 'main' branch)

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/shuf/shuf-reservoir (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/sort/sort-stale-thread-mem (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/tail/inotify-dir-recreate (passes in this run but fails in the 'main' branch)
Note: The gnu test tests/basenc/bounded-memory is now being skipped but was previously passing.