try to decrease the variance in the memory usage for benchmark

[sylvestre]

No description provided.

[codspeed-hq]

Merging this PR will degrade performance by 95.09%

❌ 3 regressed benchmarks
✅ 279 untouched benchmarks
⏩ 38 skipped benchmarks¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	numfmt_large_numbers_si[10000]	32.7 ms	35.1 ms	-6.82%
❌	Memory	du_deep_tree[(100, 3)]	159.2 KB	3,239 KB	-95.09%
❌	Simulation	du_deep_tree[(100, 3)]	1.2 ms	1.3 ms	-10.23%

---

_{Comparing sylvestre:bench-mem-2 (20ad29b) with main (fe748f4)}

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. ↩

[sylvestre]

let's see if it works!