fixed select_buffer in the lib

Former-commit-id: 13c418ed5990300a0c15278e490726dd01680dd2

bindings/codemp_client.cpython-38-darwin.so.REMOVED.git-id

@@ -1 +1 @@
-c89068ebc710e18686da3486ffb87421db21e058
+55ed2ebf31cde48dafa1993cd5227bbe01669172

src/lib.rs

@@ -169,7 +169,10 @@ impl PyClientHandle {
                 .await
                 .map_err(PyCodempError::from)?;
 
-            Ok(cont)
+            Python::with_gil(|py| {
+                let pystr: Py<PyString> = PyString::new(py, cont.as_str()).into();
+                Ok(pystr)
+            })
         })
     }
 }