test fix after str changes

tests/run/literals.pyx

@@ -37,7 +37,7 @@ double quoted string."""
     i = 'This string\
  has an ignored newline.'
     j = 'One-char escapes: \'\"\\\a\b\f\n\r\t\v'
-    k = 'Oct and hex escapes: \1 \12 \123 \x45 \xaf \xAF'
+    k = b'Oct and hex escapes: \1 \12 \123 \x45 \xaf \xAF'
     l = r'''This is\
 a \three \line
 raw string with some backslashes.'''