chore(deps): 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

@@ -40,7 +40,7 @@ thiserror = "1.0.25"
 time = { version = "0.3", features = ["serde", "serde-well-known", "serde-human-readable", "macros"] }
 num = "0.4.0"
 ndarray = "0.15.3"
-pyo3 = { version = "0.19.0" }
+pyo3 = { version = "0.20.0" }
 tracing = "0.1"
 csv = "1.1"
 hdf5 = { version="0.8.1" }

pywr-python/Cargo.toml

@@ -15,7 +15,7 @@ categories = ["science", "simulation"]
 
 [dependencies]
 pyo3-polars = "0.7.0"
-pyo3 = { version = "0.19.0" }
+pyo3 = { version = "0.20.0" }
 serde = { workspace = true }
 serde_json = { workspace = true }
 pywr-core = { path="../pywr-core" }