chore: update CONTRIBUTING.md

[a10y]

pointed out in #5628

[codspeed-hq]

CodSpeed Performance Report

Merging #5657 will improve performances by 12.72%

_{Comparing contributing-update (dfe00bc) with develop (ec5c119)}

Summary

⚡ 1 improvement
✅ 1157 untouched
⏩ 617 skipped¹

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	encode_specialized	2.7 ms	2.4 ms	+12.72%

Footnotes

1. 617 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. ↩

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.28%. Comparing base (4e98558) to head (dfe00bc).
⚠️ Report is 6 commits behind head on develop.

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