Update rand_distr requirement from 0.5.1 to 0.6.0

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@0.5.1...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]

plotters/Cargo.toml

@@ -129,7 +129,7 @@ plotters = { path = ".", features = ["serialization"] }
 
 [target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies]
 rand = "0.9.2"
-rand_distr = "0.5.1"
+rand_distr = "0.6.0"
 rand_xorshift = "0.4.0"
 
 [target.'cfg(all(target_arch = "wasm32", not(target_os = "wasi")))'.dev-dependencies]