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]

plotly/Cargo.toml

@@ -92,5 +92,5 @@ itertools = ">=0.10, <0.15"
 itertools-num = "0.1"
 ndarray = "0.17"
 plotly_static = { path = "../plotly_static" }
-rand_distr = "0.5"
+rand_distr = "0.6"
 base64 = "0.22"