Update rand_distr requirement from 0.5 to 0.6

Updates the requirements on [rand_distr](https://github.com/rust-random/rand_distr) to permit the latest version.
- [Release notes](https://github.com/rust-random/rand_distr/releases)
- [Changelog](https://github.com/rust-random/rand_distr/blob/master/CHANGELOG.md)
- [Commits](rust-random/rand_distr@0.5.0...0.6.0)

---
updated-dependencies:
- dependency-name: rand_distr
  dependency-version: 0.6.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Cargo.toml

@@ -36,7 +36,7 @@ plotters = { version="0.3", default-features = false, features=[
         "colormaps"
 ]}
 rand = { version="0.9", features = ["small_rng"] }
-rand_distr = "0.5"
+rand_distr = "0.6"
 rand_chacha = { version="0.9", features=["serde"] }
 serde = "1.0"
 tempfile = "3"