bpo-37444: Update differing exception between builtins and importlib (GH-14869)

Imports now raise `TypeError` instead of `ValueError` for relative import failures. This makes things consistent between `builtins.__import__` and `importlib.__import__` as well as using a more natural import for the failure.


https://bugs.python.org/issue37444



Automerge-Triggered-By: @brettcannon

Python/import.c

@@ -1671,7 +1671,7 @@ resolve_name(PyThreadState *tstate, PyObject *name, PyObject *globals, int level
             goto error;
         }
         else if (last_dot == -1) {
-            _PyErr_SetString(tstate, PyExc_ValueError,
+            _PyErr_SetString(tstate, PyExc_ImportError,
                              "attempted relative import beyond top-level "
                              "package");
             goto error;