Python: Update test results for ReturnTypes.ql for Python 2.

Author: tausbn

python/ql/test/2/library-tests/types/functions/ReturnTypes.expected

@@ -1,3 +1,4 @@
+| 4 | bump_version | builtin-class object |
 | 6 | ok1 | builtin-class NoneType |
 | 12 | ok2 | builtin-class int |
 | 12 | ok2 | builtin-class str |
@@ -21,4 +22,4 @@
 | 112 | multi_return | builtin-class int |
 | 118 | do_something | builtin-class int |
 | 123 | with_flow | builtin-class int |
-| 128 | return_default | builtin-class tuple |
+| 128 | return_default | builtin-class tuple |