replace PyErr::from_instance with PyErr::from_value

Since [pyo3 0.16.0](https://pyo3.rs/main/changelog):

Rename some methods on PyErr (the old names are just marked deprecated for now):
- pytype -> get_type
- pvalue -> value (and deprecate equivalent instance)
- ptraceback -> traceback
- from_instance -> from_value
- into_instance -> into_value

PyO3/pyo3#2026

crates/pyhq/src/utils/error.rs

@@ -9,7 +9,7 @@ pub(crate) trait ToPyError {
 impl ToPyError for HqError {
     fn to_py(self) -> PyErr {
         Python::with_gil(|py| {
-            PyErr::from_instance(PyException::new_err(format!("{self:?}")).instance(py))
+            PyErr::from_value(PyException::new_err(format!("{self:?}")).value(py))
         })
     }
 }