build(deps): update rand_distr requirement from 0.3.0 to 0.4.0

Updates the requirements on [rand_distr](https://github.com/rust-random/rand) to permit the latest version.
- [Release notes](https://github.com/rust-random/rand/releases)
- [Changelog](https://github.com/rust-random/rand/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-random/rand/compare/rand_distr-0.3.0...rand_distr-0.4.0)

Cargo.toml

@@ -24,7 +24,7 @@ nalgebra = { version = "0.23.0", optional = true }
 num-traits = "0.2.12"
 num = "0.3.0"
 rand = "0.8.3"
-rand_distr = "0.3.0"
+rand_distr = "0.4.0"
 serde = { version = "1.0.115", features = ["derive"], optional = true }
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]