Update numpy requirement from 0.19 to 0.20

Updates the requirements on [numpy](https://github.com/PyO3/rust-numpy) to permit the latest version.
- [Release notes](https://github.com/PyO3/rust-numpy/releases)
- [Changelog](https://github.com/PyO3/rust-numpy/blob/main/CHANGELOG.md)
- [Commits](PyO3/rust-numpy@v0.19.0...v0.19.0)

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

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

Cargo.toml

@@ -58,7 +58,7 @@ approx = "0.5"
 rand_pcg = "0.3"
 pyo3 = { version = "0.19.0", optional = true, features = ["extension-module"] }
 pyo3-log = { version = "0.9.0", optional = true }
-numpy = { version = "0.19", optional = true }
+numpy = { version = "0.20", optional = true }
 indicatif = { version = "0.17", features = ["rayon"] }
 rstats = "2.0.1"
 thiserror = "1.0"