chore(deps): update rust crate regex to v1.12.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
regex	dev-dependencies	patch	1.12.3 → 1.12.4

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Release Notes

rust-lang/regex (regex)

v1.12.4

Compare Source

===================
This release includes a performance optimization for compilation of regexes
with very large character classes.

Improvements:

• #​1308:
  Avoid re-canonicalizing the entire interval set when pushing new class ranges.

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📊 iai-callgrind Benchmark Results

⚠️ 1 Regression(s) Detected

| Benchmark | Base | PR | Change | % |
|-----------|------|----|---------|
| iai_algos::corner_to_corner_idastar | 193,019 | 193,630 | +611 | +0.32% |

➡️ 19 Unchanged (within ±0.1%)

Click to expand

Benchmark	Instructions
iai_algos::corner_to_corner_astar	145,280
iai_algos::corner_to_corner_bfs	2,936,259
iai_algos::corner_to_corner_bfs_bidirectional	3,861,879
iai_algos::corner_to_corner_dfs	3,577,691
iai_algos::corner_to_corner_dijkstra	3,676,983
iai_algos::corner_to_corner_fringe	215,035
iai_algos::corner_to_corner_iddfs	3,718,119
iai_algos::no_path_astar	3,291,154
iai_algos::no_path_bfs	2,715,592
iai_algos::no_path_bfs_bidirectional	3,363,911
iai_algos::no_path_dfs	3,615,408
iai_algos::no_path_dijkstra	3,638,174
iai_algos::no_path_fringe	4,426,243
iai_edmondskarp::wikipedia_example_dense	38,116
iai_edmondskarp::wikipedia_example_sparse	65,754
iai_kuhn_munkres::kuhn_munkres_size_128	4,934,499
iai_kuhn_munkres::kuhn_munkres_size_32	302,217
iai_kuhn_munkres::kuhn_munkres_size_64	1,426,311
iai_separate_components::bench_separate_components	16,542,137

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iai-callgrind measures instructions executed, which is deterministic and not affected by system load.