deps: update ndarray requirement from 0.15 to 0.16

Updates the requirements on [ndarray](https://github.com/rust-ndarray/ndarray) to permit the latest version.
- [Release notes](https://github.com/rust-ndarray/ndarray/releases)
- [Changelog](https://github.com/rust-ndarray/ndarray/blob/master/RELEASES.md)
- [Commits](rust-ndarray/ndarray@ndarray-rand-0.15.0...0.16.1)

---
updated-dependencies:
- dependency-name: ndarray
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Cargo.toml

@@ -126,7 +126,7 @@ bio = "2.0"
 needletail = "0.5"
 ahash = "0.8.11"
 numpy = "0.21"
-ndarray = { version = "0.15", features = ["serde", "rayon"] }
+ndarray = { version = "0.16", features = ["serde", "rayon"] }
 num-traits = { version = "0.2" }
 serde = "1.0"
 serde_derive = "1.0"