FIX: ubuntu enum could not be converted to int, not it is converted t…

…o string for interop with nanobind

.bumpversion.cfg

@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.5.0
+current_version = 0.5.1
 message = Bump version to {new_version}
 commit = True
 tag = True