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](https://github.com/rust-random/rand_distr/compare/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>

Cargo.toml

@@ -85,7 +85,7 @@ test-log = "0.2.10"
 futures = "0.3.21"
 paste = "1.0.11"
 more-asserts = "0.3.1"
-rand_distr = "0.5"
+rand_distr = "0.6"
 time = { version = "0.3.47", features = ["serde-well-known", "macros"] }
 postcard = { version = "1.0.4", features = [
     "use-std",

stacker/Cargo.toml

@@ -28,7 +28,7 @@ zipf = "7.0.0"
 rustc-hash = "2.1.0"
 proptest = "1.2.0"
 binggan = { version = "0.16.1" }
-rand_distr = "0.5"
+rand_distr = "0.6"
 
 [features]
 compare_hash_only = ["ahash"] # Compare hash only, not the key in the Hashmap