Revert "chore(deps): update rust crate indexmap to v2.12.1"

[samueltardieu]

This reverts commit 6fa8207.

[coderabbitai]

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[codspeed-hq]

CodSpeed Performance Report

Merging #727 will degrade performances by 12.96%

_{Comparing perf/revert-indexmap (a5c7934) with main (6fa8207)}

Summary

⚡ 6 improvements
❌ 1 regression
✅ 31 untouched

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

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	fill-corner_to_corner_bfs	1.5 ms	1.1 ms	+33.59%
⚡	fill-corner_to_corner_dfs	4.1 ms	3.5 ms	+15.87%
⚡	fill-corner_to_corner_dijkstra	1.5 ms	1.2 ms	+20.04%
⚡	fill-no_path_astar	1.5 ms	1.2 ms	+23.82%
⚡	fill-no_path_bfs	1.4 ms	1.2 ms	+18.33%
❌	fill-no_path_fringe	1.2 ms	1.4 ms	-12.96%
⚡	no_path_dijkstra	1.5 ms	1.3 ms	+10.47%

[samueltardieu]

Codspeed doesn't look reliable here.