patch 8.1.1033: memory usage test may still fail on some systems

Problem:    Memory usage test may still fail on some systems. (Elimar
            Riesebieter)
Solution:   Increase tolerance from 1% to 3%.

src/version.c

@@ -779,6 +779,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1033,
 /**/
     1032,
 /**/