fix: upgrade python ABI to 3.9 from 3.8

The release of pyo3 0.22.3 compells this since we cannot otherwise
compile. The choice is between pinning 0.22.2 and upgrading our ABI, and
I think it's better to upgrade the ABI

python/Cargo.toml

@@ -44,7 +44,7 @@ deltalake-mount = { path = "../crates/mount" }
 
 [dependencies.pyo3]
 version = "0.22.2"
-features = ["extension-module", "abi3", "abi3-py38"]
+features = ["extension-module", "abi3", "abi3-py39"]
 
 [dependencies.deltalake]
 path = "../crates/deltalake"

python/src/lib.rs

@@ -1417,7 +1417,8 @@ fn scalar_to_py<'py>(value: &Scalar, py_date: &Bound<'py, PyAny>) -> PyResult<Bo
                 py_struct.set_item(field.name(), scalar_to_py(value, py_date)?)?;
             }
             py_struct.to_object(py)
-        }
+        },
+        Array(val) => todo!("how should this be converted!"),
     };
 
     Ok(val.into_bound(py))