test: do not use "object" for the type annotation

Usually we use "Any" type for the type annotation which takes any kinds
of types, instead of "object" class.  So this replaces "object" to "Any"
in our example.

tests/test_ext_autodoc_configs.py

@@ -490,7 +490,7 @@ def test_autodoc_typehints_signature(app):
         '.. py:module:: target.typehints',
         '',
         '',
-        '.. py:class:: Math(s: str, o: object = None)',
+        '.. py:class:: Math(s: str, o: Any = None)',
         '   :module: target.typehints',
         '',
         '',