prepare for PyCXX 7.0

src/Mod/Part/App/OffsetCurvePyImp.cpp

@@ -145,8 +145,7 @@ void OffsetCurvePy::setBasisCurve(Py::Object arg)
             curve2->SetBasisCurve(curve);
         }
         catch (Standard_Failure& e) {
-    
-            throw Py::Exception(e.GetMessageString());
+                throw Py::RuntimeError(e.GetMessageString());
         }
     }
 }