Bump the minor-patch-dependencies group across 1 directory with 3 updates (#98)

* Bump the minor-patch-dependencies group across 1 directory with 3 updates

Bumps the minor-patch-dependencies group with 3 updates in the / directory: [serde](https://github.com/serde-rs/serde), [serde_json](https://github.com/serde-rs/json) and [pyo3](https://github.com/pyo3/pyo3).


Updates `serde` from 1.0.196 to 1.0.210
- [Release notes](https://github.com/serde-rs/serde/releases)
- [Commits](serde-rs/serde@v1.0.196...v1.0.210)

Updates `serde_json` from 1.0.113 to 1.0.128
- [Release notes](https://github.com/serde-rs/json/releases)
- [Commits](serde-rs/json@v1.0.113...1.0.128)

Updates `pyo3` from 0.19.2 to 0.21.2
- [Release notes](https://github.com/pyo3/pyo3/releases)
- [Changelog](https://github.com/PyO3/pyo3/blob/main/CHANGELOG.md)
- [Commits](PyO3/pyo3@v0.19.2...v0.21.2)

---
updated-dependencies:
- dependency-name: serde
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: minor-patch-dependencies
- dependency-name: serde_json
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: minor-patch-dependencies
- dependency-name: pyo3
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: minor-patch-dependencies
...

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

* Remove deprecated cast_as()

* Fix error about OperatingSystem::Aix

* Fix cast inference

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Mathieu Leplatre <[email protected]>

Author: dependabot[bot]

Cargo.lock

@@ -17,5 +17,5 @@ serde_json = "1.0"
 canonical_json = "0.5.0"
 
 [dependencies.pyo3]
-version = "0.19.2"
+version = "0.21.2"
 features = ["extension-module"]

Cargo.toml

@@ -87,7 +87,7 @@ pub fn dumps(py: Python, obj: PyObject) -> PyResult<PyObject> {
 fn to_json(py: Python, obj: &PyObject) -> Result<serde_json::Value, PyCanonicalJSONError> {
     macro_rules! return_cast {
         ($t:ty, $f:expr) => {
-            if let Ok(val) = obj.cast_as::<$t>(py) {
+            if let Ok(val) = obj.downcast::<$t>(py) {
                 return $f(val);
             }
         };
@@ -142,14 +142,17 @@ fn to_json(py: Python, obj: &PyObject) -> Result<serde_json::Value, PyCanonicalJ
         Ok(serde_json::Value::Object(map))
     });
 
-    return_cast!(PyList, |x: &PyList| Ok(serde_json::Value::Array(r#try!(x
-        .iter()
-        .map(|x| to_json(py, &x.to_object(py)))
-        .collect()))));
+    return_cast!(PyList, |x: &PyList| {
+        let json_array: Result<Vec<_>, _> =
+            x.iter().map(|x| to_json(py, &x.to_object(py))).collect(); // This turns the iterator into a Result<Vec<Value>, PyCanonicalJSONError>
+        Ok(serde_json::Value::Array(json_array?))
+    });
 
-    return_cast!(PyTuple, |x: &PyTuple| Ok(serde_json::Value::Array(r#try!(
-        x.iter().map(|x| to_json(py, &x.to_object(py))).collect()
-    ))));
+    return_cast!(PyTuple, |x: &PyTuple| {
+        let json_array: Result<Vec<_>, _> =
+            x.iter().map(|x| to_json(py, &x.to_object(py))).collect(); // This turns the iterator into a Result<Vec<Value>, PyCanonicalJSONError>
+        Ok(serde_json::Value::Array(json_array?))
+    });
 
     return_cast!(PyFloat, |x: &PyFloat| {
         match serde_json::Number::from_f64(x.value()) {