coreutils: replace /proc/ by /dev/

[oech3]

Closes #12552

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/tail/inotify-dir-recreate (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/tail/tail-n0f (passes in this run but fails in the 'main' branch)
Note: The gnu test tests/cut/cut-huge-range is now being skipped but was previously passing.
Congrats! The gnu test tests/cut/bounded-memory is now passing!
Congrats! The gnu test tests/tail/pipe-f is now passing!

[sylvestre]

please explain the why in the commit message

[codspeed-hq]

Merging this PR will degrade performance by 13.49%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

❌ 2 regressed benchmarks
✅ 355 untouched benchmarks
⏩ 50 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	false_consecutive_calls	294.7 ns	350.2 ns	-15.86%
❌	Simulation	mv_directory	7.3 ms	8.2 ms	-11.05%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing oech3:patch-1 (cfabc07) with main (adba541)²}

Footnotes

1. 50 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 (1c68c61) during the generation of this report, so adba541 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[sylvestre]

selinux is sad :)
maybe we skip it here?

[github-actions]

Binary size comparison:

Individual binary size comparison VS main (threshold: >=5% AND >=4 KB).

Total size of compared binaries: 152.18 MB (+1004 KB, +0.65%)

Significant per-binary changes:
  comm     1.12 MB ->    2.33 MB  (+1.21 MB, +107.29%)

[oech3]

Test on SELinux seems fixed now.

[oech3]

@sylvestre ready to merge. (conflicted at cspell after CI passed).