Update the rand crate to 0.9.x

- `thread_rng` becomes just `rng`.
- `gen` is renamed to `random`, `gen_range` to `random_range`.
- Avoid using the `rand` feature of the not yet updated crate `lowdim`.

Cargo.toml

@@ -11,9 +11,9 @@ license = "MIT OR Apache-2.0"
 edition = "2021"
 
 [dependencies]
-rand = "0.8.4"
 chrono = "0.4.6"
-lowdim = { version = "0.6.0", features = ["random"] }
+lowdim = { version = "0.6.0" }
 primal = "0.3.3"
+rand = "0.9.2"
 serde = { version = "1.0.215", features = ["derive"] }
 serde_json = "1.0.132"