Update pyo3 requirement from 0.19.0 to 0.20.0

Updates the requirements on [pyo3](https://github.com/pyo3/pyo3) to permit the latest version.
- [Release notes](https://github.com/pyo3/pyo3/releases)
- [Changelog](https://github.com/PyO3/pyo3/blob/main/CHANGELOG.md)
- [Commits](PyO3/pyo3@v0.19.0...v0.19.2)

---
updated-dependencies:
- dependency-name: pyo3
  dependency-type: direct:production
...

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

Cargo.toml

@@ -56,7 +56,7 @@ rayon = "1.6"
 lazy_static = "1.4.0"
 approx = "0.5"
 rand_pcg = "0.3"
-pyo3 = { version = "0.19.0", optional = true, features = ["extension-module"] }
+pyo3 = { version = "0.20.0", optional = true, features = ["extension-module"] }
 pyo3-log = { version = "0.8.2", optional = true }
 numpy = { version = "0.19", optional = true }
 indicatif = { version = "0.17", features = ["rayon"] }