chore: upgrade rand to 0.10 and rand_xorshift to 0.5

[Copilot]

Bumps rand from 0.9.2 → 0.10.0 and rand_xorshift from 0.4.0 → 0.5.0.

API migration

rand 0.10 moves the convenience methods (random, random_range, random_ratio, random_bool) off Rng and onto a new RngExt trait. RngCore is no longer re-exported from rand; its primitives (next_u32, next_u64, etc.) now live on Rng from rand_core.

Import fixes across benches/tests/examples

File	Change
benches/algos.rs	RngCore as _ → RngExt as _
benches/separate_components.rs	RngCore as _ → RngExt as _
benches/iai_separate_components.rs	RngCore as _ → RngExt as _
benches/kuhn_munkres.rs	Rng as _ → RngExt as _
benches/iai_kuhn_munkres.rs	Rng as _ → RngExt as _
tests/dijkstra-all.rs	Rng as _ → RngExt as _
examples/kuhn_munkres_complexity.rs	Rng → RngExt

Files already using use rand::prelude::* are unaffected — prelude re-exports RngExt in 0.10.

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[github-actions]

📊 iai-callgrind Benchmark Results

⚠️ 1 Regression(s) Detected

| Benchmark | Base | PR | Change | % |
|-----------|------|----|---------|
| iai_separate_components::bench_separate_components | 15,992,811 | 16,549,909 | +557,098 | +3.48% |

✅ 3 Improvement(s)

| Benchmark | Base | PR | Change | % |
|-----------|------|----|---------|
| iai_kuhn_munkres::kuhn_munkres_size_32 | 303,986 | 296,982 | -7,004 | -2.30% |
| iai_kuhn_munkres::kuhn_munkres_size_64 | 1,434,909 | 1,414,622 | -20,287 | -1.41% |
| iai_kuhn_munkres::kuhn_munkres_size_128 | 4,965,503 | 4,931,229 | -34,274 | -0.69% |

➡️ 16 Unchanged (within ±0.1%)

Click to expand

Benchmark	Instructions
iai_algos::corner_to_corner_astar	150,136
iai_algos::corner_to_corner_bfs	2,947,648
iai_algos::corner_to_corner_bfs_bidirectional	3,881,580
iai_algos::corner_to_corner_dfs	3,592,021
iai_algos::corner_to_corner_dijkstra	3,734,617
iai_algos::corner_to_corner_fringe	216,701
iai_algos::corner_to_corner_idastar	194,009
iai_algos::corner_to_corner_iddfs	3,718,131
iai_algos::no_path_astar	3,348,856
iai_algos::no_path_bfs	2,756,526
iai_algos::no_path_bfs_bidirectional	3,383,731
iai_algos::no_path_dfs	3,629,686
iai_algos::no_path_dijkstra	3,691,818
iai_algos::no_path_fringe	4,417,030
iai_edmondskarp::wikipedia_example_dense	38,324
iai_edmondskarp::wikipedia_example_sparse	65,760

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