Update pyo3 requirement from 0.19 to 0.20

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...v0.20.0)

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

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

arrow-pyarrow-integration-testing/Cargo.toml

@@ -34,4 +34,4 @@ crate-type = ["cdylib"]
 
 [dependencies]
 arrow = { path = "../arrow", features = ["pyarrow"] }
-pyo3 = { version = "0.19", features = ["extension-module"] }
+pyo3 = { version = "0.20", features = ["extension-module"] }

arrow-pyarrow-integration-testing/pyproject.toml

@@ -16,7 +16,7 @@
 # under the License.
 
 [build-system]
-requires = ["maturin"]
+requires = ["maturin>=1.0,<2.0"]
 build-backend = "maturin"
 
 dependencies = ["pyarrow>=1"]

arrow/Cargo.toml

@@ -60,7 +60,7 @@ arrow-select = { workspace = true }
 arrow-string = { workspace = true }
 
 rand = { version = "0.8", default-features = false, features = ["std", "std_rng"], optional = true }
-pyo3 = { version = "0.19", default-features = false, optional = true }
+pyo3 = { version = "0.20", default-features = false, optional = true }
 
 [package.metadata.docs.rs]
 features = ["prettyprint", "ipc_compression", "ffi", "pyarrow"]