bpo-34087: Fix buffer overflow in int(s) and similar functions (GH-8274)


`_PyUnicode_TransformDecimalAndSpaceToASCII()` missed trailing NUL char.
It caused buffer overflow in `_Py_string_to_number_with_underscores()`.

This bug is introduced in 9b6c60cb.
(cherry picked from commit 16dfca4d829e45f36e71bf43f83226659ce49315)

Co-authored-by: INADA Naoki <methane@users.noreply.github.com>
diff --git a/Lib/test/test_long.py b/Lib/test/test_long.py
index cc48259..8472889 100644
--- a/Lib/test/test_long.py
+++ b/Lib/test/test_long.py
@@ -373,6 +373,10 @@
         for base in invalid_bases:
             self.assertRaises(ValueError, int, '42', base)
 
+        # Invalid unicode string
+        # See bpo-34087
+        self.assertRaises(ValueError, int, '\u3053\u3093\u306b\u3061\u306f')
+
 
     def test_conversion(self):