pythongh-104328: Fix typo in typing.Generic multiple inheritance …

…error message (pythonGH-104335)

(cherry picked from commit 01c321c)

Co-authored-by: Kirill Podoprigora <kirill.bast9@mail.ru>

Lib/typing.py

@@ -1860,7 +1860,7 @@ def __init_subclass__(cls, *args, **kwargs):
                         base.__origin__ is Generic):
                     if gvars is not None:
                         raise TypeError(
-                            "Cannot inherit from Generic[...] multiple types.")
+                            "Cannot inherit from Generic[...] multiple times.")
                     gvars = base.__parameters__
             if gvars is not None:
                 tvarset = set(tvars)